HDE 20+4 Pin LCD Power Supply Tester for ATX, ITX, BTX, PCI-E, SATA, HDD Easily test your computer power supply and avoid damage to computer equipment | No batteries required Compatible with ATX, BTX, ITX power supplies Voltage Source: 20/24pin (ATX-connector) | Voltage Test: +3.3V, +5V, +VSB, and +12V Size: 4.75 x 2.5 / 12.07cm x 6.35cm; Color: Black Package Contents: 1x Digital Power Supply Tester, 1x Instruction Sheet Weight: 82g Dimensions: 2.52 x 5.91 x 0.71 Voltage source: 20/24 pin (ATX  Connector) Voltage test: +12V, +5V, +3.3V, +5V Stand By (SB) 12V Power