Recommended Products
DELL 8GB DDR4 laptop RAM UPGRADE 260-pin SO-DIMM modules with speeds of 2133MHz, 2400MHz, 2666MHz, or 3200MHz,
DELL 8GB DDR4 laptop RAM UPGRADE 260-pin SO-DIMM modules with speeds of 2133MHz, 2400MHz, 2666MHz, or 3200MHz,
Dell Latitude E5570 Intel Core i5 6th Generation 8GB RAM 256GB SSD Laptop
Model: Dell Latitude E5570
Processor: Intel Core i5 6th Generation
Memory: 8GB RAM
Storage: 256GB Solid State Drive (SSD)
Display: 15.6-inch display
Graphics: Integrated Intel Graphics
Keyboard: Comfortable business keyboard
Connectivity: USB, HDMI, Ethernet, Wi-Fi, Bluetooth
Operating System: Windows
Build: Professional business-class chassis
HP EliteBook x360 1030 G2 Intel Core i7 7th Gen 16GB RAM 512GB SSD
Model: HP EliteBook x360 1030 G2
Processor: Intel Core i7, 7th Generation
Memory: 16GB DDR4 RAM
Storage: 512GB Solid State Drive (SSD)
Display: 13.3-inch touch display with pen support
Graphics: Integrated Intel Graphics
Keyboard: Spill-resistant, professional keyboard
Connectivity: USB-C, USB-A, HDMI, Wi-Fi, Bluetooth
Operating System: Windows (configuration dependent)
Design: Durable aluminum convertible chassis
HP ProBook 440 G9 Laptop, Intel Core i5-1235U up to 4.4GHz, 8GB DDR4, 256GB NVMe SSD Laptop
HP ProBook 440 G9 Laptop, Intel Core i5-1235U up to 4.4GHz, 8GB DDR4, 256GB NVMe SSD Laptop
Brand: HP
Model: ProBook 440 G9
Processor: Intel Core i5-1235U (12th Gen, Deca-core, Turbo up to 4.4GHz)
Memory: 8GB DDR4 RAM
Storage: 256GB NVMe SSD
Display: 14″ Full HD
Graphics: Integrated Intel Iris Xe Graphics
Keyboard: Full-size keyboard
Touchpad: Precision touchpad
Connectivity: USB-C, USB-A, HDMI, Wi-Fi 6, Bluetooth
Operating System: Windows 11
Ideal Use: Office productivity, remote work, study, everyday professional tasks
Macbook air 2022 charger (M2) USB-C 67W
Macbook air 2022 charger (M2) USB-C 67W
Product Type: Power Adapter
Output Power: 67W
Connector Type: USB-C
Input Voltage: 100–240V AC
Charging Technology: USB-C Power Delivery (PD)
Compatibility: MacBook Air M2 (2022)
Condition: Tested and verified
This charger meets Apple’s standards for fast, safe, and efficient charging.
HP Z24f G3 24-Inch 1920×1080 Full HD IPS LCD Monitor
Brand: HP
Model: Z24f G3
Display Size: 24 inches
Resolution: Full HD (1920×1080)
Panel Type: IPS LCD
Aspect Ratio: 16:9
Brightness: Typical LED-lit performance
Contrast Ratio: Typically 1000:1
Response Time: 5 ms (typical)
Viewing Angles: 178° horizontal / 178° vertical
Color Support: Up to 16.7 million colors
Connectivity:
HDMI
DisplayPort
(Additional ports model dependent)
Stand Adjustments: Height, tilt, swivel, pivot
Mounting: VESA compatible
Design: Slim bezel, modern finish
Energy Efficiency: LED backlit with power-saving features
Dell Optiplex 390 Mini Tower Core i5 8GB 500GB
Model: Dell OptiPlex 390 Mini Tower
Processor: Intel Core i5
Memory: 8GB RAM (Upgradeable)
Storage: 500GB Hard Disk Drive
Graphics: Intel Integrated Graphics
Networking: Ethernet
Ports: USB 2.0/3.0, VGA, DisplayPort, Audio I/O
Form Factor: Mini Tower
Operating System: Windows
Dell Optiplex 9020 SFF Core i7 4th Gen 16GB RAM 500GB Hard Drive
Model: Dell OptiPlex 9020 Small Form Factor
Processor: Intel Core i7 4th Generation
Memory: 16GB DDR3 RAM (Upgradeable)
Storage: 500GB Hard Disk Drive
Graphics: Intel Integrated Graphics
Networking: Gigabit Ethernet
Ports: USB 2.0/3.0, DisplayPort, VGA, Audio I/O
Security: TPM, Secure Boot, BIOS Protection
Form Factor: Small Form Factor (SFF)
Operating System: Windows 11 Pro or Windows 11 (based on configuration)
Shop
Showing 169–192 of 725 resultsSorted by latest
-
Computer Accessories, Power Supplies
HP ATX Omen 880 918585-001 PS-8501-2 500W PSU
- Manufacturer: HP / Hewlett Packard Enterprise (Manufactured by Lite-On / Delta)
- Model Number: PS-8501-2
- Alternate Model Number: DPS-500AB-20 A, H9-1400
- HP Spare Part Number: 918585-001
- Device Type: Internal Gaming Desktop Power Supply
- Form Factor: Standard ATX
- Dimensions: 150mm x 87mm x 140mm [1, 2, 3, 4, 5]
Electrical & Power Performance- Maximum Output Power: 500 Watts continuous
- Input Voltage Range: 100V – 240V AC (Auto-Ranging)
- Input Frequency: 50Hz – 60Hz
- Input Current: 7.0A Max
- Efficiency Certification: 80 PLUS Bronze Certified
- Power Factor Correction: Active PFC
- Cooling System: Integrated quiet cooling fan with smart thermal speed sensors [1, 2, 3, 4]
SKU: n/a -
Computer Accessories, Power Supplies
HP XW6200 XW6400 500W power supply 345525-004/005 345525-001 DPS-470AB-1
Computer Accessories, Power SuppliesHP XW6200 XW6400 500W power supply 345525-004/005 345525-001 DPS-470AB-1
- Manufacturer: HP / Hewlett Packard Enterprise (Manufactured by Delta Electronics)
- Model Number: DPS-470AB-1
- HP Assembly Part Number: 345525-001
- HP Spare Part Numbers: 345525-004, 345525-005
- Device Type: Internal Workstation Power Supply
- Form Factor: Proprietary HP Workstation Chassis
- Maximum Output Power: 500 Watts
- Input Voltage Range: 100V – 240V AC (Auto-Ranging)
- Input Frequency: 50Hz – 60Hz
- Input Current: 8.0A Max
- Cooling System: Integrated high-airflow dedicated cooling fan for low-noise thermal dissipation
SKU: n/a -
Computer Accessories, Power Supplies
HP PROLIANT ML150 ML330 G6 500447-B21 466398-B21 460W POWER SUPPLY
Computer Accessories, Power SuppliesHP PROLIANT ML150 ML330 G6 500447-B21 466398-B21 460W POWER SUPPLY
-
Wattage Output: 460W
-
Input Voltage: 100–240V (auto-sensing)
-
Form Factor: Server power supply unit
-
Efficiency: 80 PLUS certified for energy savings
-
Part Numbers: 500447-B21, 466398-B21
-
Connectors: Compatible with HP server hardware
SKU: n/a -
-
Computer Accessories, Power Supplies
HP PAVILLION SERVER POWER SUPPLY 250W S5000 504968-001 HP-D2701C0
Computer Accessories, Power SuppliesHP PAVILLION SERVER POWER SUPPLY 250W S5000 504968-001 HP-D2701C0
- Manufacturer: HP / Hewlett Packard Enterprise
- Model Number: HP-D2701C0
- Alternate Model Number: HP-D2201C0
- HP Spare Part Number: 504968-001
- HP Alternate Part Number: 617038-001
- Device Type: Internal Small Form Factor Power Supply
- Chassis Form Factor: TFX / Pavilion Slimline
SKU: n/a -
Computer Accessories, Power Supplies
HP ML10 HP-XD301MGF Tower Server Power Supply 731545-001 732598-001
Computer Accessories, Power SuppliesHP ML10 HP-XD301MGF Tower Server Power Supply 731545-001 732598-001
-
Form Factor: ATX (Standard)
-
Max Output Power: 300 Watts
-
Efficiency Rating: 80 PLUS Bronze
-
AC Input Range: 100V–240V AC (Auto-Ranging / Active PFC)
-
Input Frequency Range: 50Hz–60Hz
-
Power Factor Correction: Active
-
Rail Design: Single 12V Rail
-
Modularity: Non-Modular
-
Hot Swappable: No
-
Redundant Support: No
-
Cooling System: 1 x Integrated Active Cooling Fan
Connectors Included
-
1 x 24-pin ATX Motherboard Power
-
1 x 4-pin ATX 12V CPU Power
-
SATA Power Connectors
-
Molex Peripheral Connectors
Compatible Part Numbers
-
731545-001
-
732598-001
-
HP-XD301MGF
System Compatibility
-
HP ProLiant ML10
-
HP ProLiant ML10 Gen9
SKU: n/a -
-
Computer Accessories, Power Supplies
HP Pro 3400 3330 3380 3500 MT Power Supply PSU 300W 633190-001 667892-001
Computer Accessories, Power SuppliesHP Pro 3400 3330 3380 3500 MT Power Supply PSU 300W 633190-001 667892-001
- Product Type: Internal Desktop Power Supply Unit (PSU)
- Form Factor: Standard ATX Microtower (MT)
- Max Output Power: 300 Watts
- AC Input Range: 100V–127V AC (8A) / 200V–240V AC (4A) Manual or Auto-Switching
- Input Frequency Range: 50Hz–60Hz
- DC Output Ratings:
-
- +12V === 19.0A
- +5V === 15.0A
- +3.3V === 12.0A
- +5Vsb === 2.0A
- -12V === 0.3A
-
- Motherboard Connectors:
-
- 1 x 24-Pin ATX Main Power Connector
- 1 x 4-Pin ATX +12V CPU Power Connector
-
- Peripheral Connectors:
-
- 4 x Right-Angle SATA Power Connectors
- 1 x 4-Pin Molex Device Connector
-
- Cooling System: 1 x 80mm Rear Exhaust Cooling Fan
SKU: n/a -
Computer Accessories, Power Supplies
HP Pro 3500 MT 300w Power Supply 667893-003 715185-001
-
Power Output: 300W
-
Input Voltage: 100V–240V AC
-
Form Factor: Standard Microtower (ATX-style)
-
Connectors Include:
-
24-pin ATX motherboard connector
-
4-pin CPU power
-
SATA power cables
-
Molex connector (for legacy drives or fans)
-
SKU: n/a -
-
Computer Accessories, Power Supplies
hp prodesk 400 g5 mt power supply
- Product Type: Internal Desktop Power Supply Unit (PSU)
- Form Factor: Custom HP Proprietary MT Block
- Max Output Power: 180 Watts
- Efficiency Rating: 80 PLUS Gold Certified
- AC Input Range: 100V–240V AC (Auto-Switching)
- Input Frequency Range: 50Hz–60Hz
- Motherboard Connectors:
-
- 1 x 4-Pin Main Motherboard Power Connector
- 1 x 4-Pin CPU +12V Power Connector
- 1 x 7-Pin Mini Flat Inline Connector
-
- Cooling System: 1 x Integrated Internal Cooling Fan
- Dimensions: 165mm x 150mm x 95mm
SKU: n/a -
Computer Accessories, Power Supplies
hp prodesk 400 g4 mt power supply
- Form Factor: Custom HP Proprietary MT Block
- Max Output Power: 180 Watts
- Efficiency Rating: 80 PLUS Gold Certified
- AC Input Range: 100V–240V AC (Auto-Switching)
- Input Frequency Range: 50Hz–60Hz
- Motherboard Connectors:
-
- 1 x 4-Pin Main Motherboard Power Connector
- 1 x 4-Pin CPU +12V Power Connector
- 1 x 7-Pin Mini Flat Inline Connector
-
- Cooling System: 1 x Integrated Internal Cooling Fan
- Dimensions: 165mm x 150mm x 95mm
SKU: n/a -
Computer Accessories, Power Supplies
hp xw4600 workstation power supply
Max Power: 475W
AC Input: 100-127V~/10.0A, 200-240V~/6A, 50-60Hz 118V~/10A, 400Hz
DC Output: 475W Max Power OutputSpecifications
-
Wattage: 400W (standard for xw4600)
-
Input Voltage: 100–240V AC
-
Form Factor: Standard ATX
-
Efficiency: 80 PLUS rated
-
Connectors: 24-pin ATX, 4/8-pin CPU, SATA, Molex, PCIe (varies by model).
SKU: n/a -
-
Computer Accessories, Power Supplies
hp prodesk 400 g3 mt power supply
- Form Factor: Custom HP Proprietary MT Block
- Max Output Power: 180 Watts Max
- Efficiency Rating: 80 PLUS Certified
- AC Input Range: 100V–240V AC (Auto-Switching)
- Input Frequency Range: 50Hz–60Hz
- DC Output Ratings:
-
- +12Vmain === 12.0A
- +12Vcpu === 10.0A
- +12Vsb === 1.5A
-
- Motherboard Connectors:
-
- 1 x Proprietary HP 6-Pin Main Power Connector
- 1 x 4-Pin CPU +12V Power Connector
-
- Cooling System: 1 x Integrated Internal Cooling Fan
- Dimensions: 165mm x 150mm x 95mm
SKU: n/a -
Computer Accessories, Power Supplies
hp xw8200 power supply
- Product Type: Internal Server/Workstation Power Supply Unit (PSU)
- Form Factor: Custom HP Proprietary Workstation EPS Large Block
- Max Output Power: 600 Watts Continuous
- Efficiency Feature: Active Power Factor Correction (APFC)
- AC Input Range: 100V–240V AC (Auto-Switching)
- Input Frequency Range: 50Hz–60Hz
- DC Output Combined Rails:
-
- Max 135W on +5V and +3.3V lines combined
- Max 516W (43A) on +12V lines combined
-
- Motherboard Connectors:
-
- 1 x 24-Pin Primary ATX Main Power Connector
- 1 x 8-Pin EPS CPU Power Connector
- 1 x 4-Pin CPU Supplemental Power Connector
-
- Peripheral & Storage Connectors:
-
- 4 x Straight SATA Power Connectors
- 6 x 4-Pin Large Molex IDE Connectors
- 2 x Floppy Drive Connectors
-
- Cooling System: 1 x Integrated High-Velocity Internal Fan
- Dimensions: 210mm x 150mm x 86mm
SKU: n/a -
Computer Accessories, Power Supplies
hp z2 g4 power supply
- Form Factor: Custom HP Proprietary SFF / Tower Block
- Wattage Options: 250 Watts / 310 Watts / 500 Watts / 650 Watts
- Efficiency Rating: Up to 92% Efficiency (80 PLUS Gold / Platinum Certified)
- AC Input Range: 100V–240V AC (Auto-Switching)
- Input Frequency Range: 50Hz–60Hz
- Motherboard Connectors:
-
- 1 x 7-Pin Mini Flat Inline Connector
- 2 x 4-Pin CPU +12V Power Connectors
-
- Graphics Connectors: 6-Pin / 8-Pin PCIe Power Connectors (available on 500W and 650W models)
- Cooling System: 1 x Integrated Internal Cooling Fan
- Dimensions: 165mm x 95mm x 72mm
SKU: n/a -
Computer Accessories, Power Supplies
hp z200 workstation power supply
Part Number : 502629-001
Max Output power:320W
Brand:HP
Compatible Model: 535799-001
Package : 1 X Power Supply
Condition: New Or Refurbished
Warranty :1 YearHP Z200 Z400 Workstations Workstation Power Supply, Delta 320W, DPS 320KB SN: 502629-001, 535799-001
Original HP HP Z200 Workstations workstation power supply, Delta 320W, DPS 320KB SN: 502629-001, 535799-001, power supply with a 20 PIN, a 4PIN, only used in the original HP Z200 original compartment, ordinary motherboard can not be used.
SKU: n/a -
Computer Accessories, Power Supplies
hp z220 SFF power supply Power Supply 240W
- Form Factor: Custom HP Proprietary SFF (Slim / Small Form Factor)
- Max Output Power: 240 Watts Continuous Delivery
- Efficiency Rating: 90% High Efficiency (80 PLUS Gold Certified level performance)
- AC Input Range: 100V–240V AC ~ 4A (Auto-Switching / Active PFC)
- Input Frequency Range: 50Hz–60Hz
- DC Output Ratings:
-
- +12Vmain === 16.0A
- +12Vcpu === 16.0A
- +12Vsb === 1.3A
- -12V === 0.15A
-
- Motherboard Connectors:
-
- 1 x Proprietary HP 6-Pin Main Power Connector
- 1 x 4-Pin ATX +12V CPU Power Connector
- 1 x 6-Pin Auxiliary Inline Connector (6+6 Pin layout variation)
-
- Peripheral Connectors:
-
- 2 x Straight SATA Power Connectors
-
- Cooling System: 1 x Integrated Internal Thermally-Controlled Cooling Fan
- Dimensions: 240mm x 94mm x 48mm
SKU: n/a -
Computer Accessories, Power Supplies
hp z230 SFF power supply Power Supply 240W
-
Wattage: 240W total output
-
Input Voltage: 100–240V (auto-sensing)
-
Form Factor: SFF (Small Form Factor)
-
Connectors: 24-pin motherboard, 4-pin CPU, SATA
-
Cooling: Quiet fan with thermal control
-
Efficiency: 80 PLUS certified for low energy waste
SKU: n/a -
-
Computer Accessories, Power Supplies
hp z240 tower workstation power supply
-
Wattage Output: 400W
-
Input Voltage: 100–240V (auto-switching)
-
Efficiency Rating: 80 PLUS certified
-
Connectors: 24-pin ATX, 4-pin or 8-pin CPU, SATA, PCIe
-
Cooling: Quiet and efficient fan
-
Form Factor: Standard fit for HP Z240 Tower case
-
-
MPN
-
796346-001, 796416-001, 796416001
-
SKU: n/a -
-
-
Computer Accessories, Power Supplies
hp z400 workstation power supply
- Product Type: Internal Workstation Power Supply Unit (PSU)
- Form Factor: Custom HP Proprietary ATX Workstation Block (Extended Depth)
- Wattage Options: 475 Watts / 600 Watts Continuous Delivery
- Efficiency Rating: 80 PLUS Certified (Bronze or Standard variations)
- AC Input Range: 100V–240V AC ~ 10A (Auto-Switching / Active PFC)
- Input Frequency Range: 50Hz–60Hz (Supports 400Hz environments on specific 118V models)
- Motherboard Connectors:
-
- 1 x Proprietary HP 24-Pin Main Power Connector (Non-standard pinout)
- 1 x 4-Pin ATX +12V CPU Power Connector
-
- Peripheral & Graphics Connectors:
-
- 1 x 6-Pin PCI-Express (PCIe) Power Connector
- 5 x Straight SATA Power Connectors
- 2 x 4-Pin Large Molex IDE Device Connectors
- 2 x Floppy Drive Connectors
-
- Cooling System: 1 x 92mm Integrated Internal Thermally-Controlled Fan
- Dimensions: 150mm x 86mm x 180mm
- Compatible HP Spare / Part Numbers: 480720-001, 468930-001, 626409-001, 626322-001, 626049-001
- Compatible Manufacturer Model Numbers: DPS-475CB-1 A, DPS-475CB-1A, Delta DPS-650LB B
- System Compatibility: HP Z400 Workstation Tower, HP xw4600 Workstation
SKU: n/a -
Computer Accessories, Power Supplies
HP Compaq DX2810 DX7400 DX7500 SFF Power Supply PSU 250W
- Form Factor: Custom Thin TFX / SFF (Small Form Factor)
- Max Output Power: 250 Watts Max Continuous Delivery
- AC Input Range: 100V–127V AC (7A) / 200V–240V AC (3.5A) Manual or Auto-Switching
- Input Frequency Range: 50Hz–60Hz
- DC Output Ratings:
-
- +12V === 14.0A
- +5V === 15.0A
- +3.3V === 12.0A
- +5Vsb === 2.0A
- -12V === 0.3A
-
- Motherboard Connectors:
-
- 1 x 24-Pin ATX Main Power Connector (Standard legacy layout)
- 1 x 4-Pin ATX +12V CPU Power Connector
-
- Peripheral Connectors:
-
- 2 x Straight SATA Power Connectors
- 1 x Floppy Drive / Berg Power Connector
-
- Cooling System: 1 x 40mm Internal Exhaust Fan
- Dimensions: 210mm x 83mm x 65mm
SKU: n/a -
Computer Accessories, Power Supplies
HP DC7608 DC7800 DC7900 MT 365W Power Supply PSU 437357-001 437799-001 PS-6361-4HP
Computer Accessories, Power SuppliesHP DC7608 DC7800 DC7900 MT 365W Power Supply PSU 437357-001 437799-001 PS-6361-4HP
- Form Factor: Custom HP Proprietary MT / CMT Block (Wide Format)
- Max Output Power: 365 Watts Continuous Delivery
- Efficiency Rating: 80 PLUS Certified (Active PFC Autosensing)
- AC Input Range: 100V–240V AC ~ 6A (Auto-Switching)
- Input Frequency Range: 50Hz–60Hz
- DC Output Ratings:
-
- +12.0Vmain === 12.0A
- +12.0Vcpu === 14.5A
- +12.0Vd === 10.5A
- +5.1V === 18.0A
- +3.3V === 22.0A
- -12.0V === 0.15A
- +5.1Vsb === 3.0A
-
- Motherboard Connectors:
-
- 1 x Proprietary HP 24-Pin Main Power Connector (Classic non-standard pinout)
- 1 x 4-Pin ATX +12V CPU Power Connector
-
- Peripheral Connectors:
-
- 4 x Straight SATA Power Connectors
- 2 x 4-Pin Large Molex IDE Device Connectors
- 1 x Floppy-Style / Berg Power Connector
-
- Cooling System: 1 x Integrated Internal Thermally-Controlled Cooling Fan
SKU: n/a -
Computer Accessories, Power Supplies
HP Compaq DX2818 DX2810 DX2710 Pro 2000 3000 MT Power Supply PSU 250W
Computer Accessories, Power SuppliesHP Compaq DX2818 DX2810 DX2710 Pro 2000 3000 MT Power Supply PSU 250W
- Form Factor: Standard ATX Microtower (MT)
- Max Output Power: 250 Watts Max Continuous Delivery
- AC Input Range: 100V–127V AC (6A) / 200V–240V AC (3A) Manual Switch
- Input Frequency Range: 50Hz–60Hz
- DC Output Ratings:
-
- +12V === 14.0A
- +5V === 18.0A
- +3.3V === 15.0A
- +5Vsb === 2.0A
- -12V === 0.3A
-
- Motherboard Connectors:
-
- 1 x 24-Pin ATX Main Power Connector (Standard legacy layout)
- 1 x 4-Pin ATX +12V CPU Power Connector
-
- Peripheral Connectors:
-
- 4 x Straight SATA Power Connectors
- 1 x 4-Pin Large Molex IDE Device Connector
-
- Cooling System: 1 x 80mm Rear Exhaust Cooling Fan
- Dimensions: 150mm x 140mm x 86mm
SKU: n/a -
Computer Accessories, Power Supplies
HP DC7700 DC7600 DC7900 ML110 G5 365W Power Supply PSU 416224-001 416535-001 PS-6361-4HFD
Computer Accessories, Power SuppliesHP DC7700 DC7600 DC7900 ML110 G5 365W Power Supply PSU 416224-001 416535-001 PS-6361-4HFD
-
Wattage Output: 365W
-
Voltage Input: 100–240V (auto-sensing)
-
Efficiency: 80 PLUS Certified
-
Cooling: Quiet internal fan
-
Form Factor: Standard ATX / Server fit
-
Connectors: 24-pin ATX, 4-pin CPU, SATA, Molex
-
Part Numbers: 416224-001, 416535-001, PS-6361-4HFD
- Model: PC6015
- Compatible With: HP Compaq dc7800p, dc7900
SKU: n/a -
-
Computer Accessories, Power Supplies
HP DC7800 SFF 240W Power Supply PSU 437351-001 437352-001 437797-001 PS-6241-7HP DPS-240MB-1 PC6014
Computer Accessories, Power SuppliesHP DC7800 SFF 240W Power Supply PSU 437351-001 437352-001 437797-001 PS-6241-7HP DPS-240MB-1 PC6014
-
Wattage Output: 240W
-
Input Voltage: 100–240V (auto-sensing)
-
Form Factor: Small Form Factor (SFF)
-
Efficiency: 80 PLUS certified
-
Cooling: Quiet fan with thermal control
-
Connectors: 24-pin ATX, 4-pin CPU, SATA, Molex
-
Part Numbers: 437351-001, 437352-001, 437797-001, PS-6241-7HP, DPS-240MB-1, PC6014
SKU: n/a -
