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 Note: Products with electrical plugs are designed for use in the US. Outlets and voltage differ internationally and this product may require an adapter or converter for use in your destination. Please check compatibility before purchasing.