[Premium Quality] - The converter set uses Solid State Capacitor, 36u Thickening Circuit Board, High Q-Value High Power Inductors and with output LED display. [Input voltage] - DC 3.2V to 40V, input voltage must be higher (1.5V) than the output voltage [Output voltage] - DC 1.25V to 35V, voltage is continuously adjustable, with high efficiency (max. 92%) and max. Output current is 3A. [System Operating Voltage Testing] - This module can be used to debug a variety of system operating voltage ranges. [Stabilize Auto Power Supply] - Just need to simply connect the input of this converter to the car's holder, then it can adjust the potentiometer, and the output voltage can be arbitrarily adjusted from DC 1.25V to 30V. It is very convenient for that Powering your devices like cellphone, MP3, MP4, PSP, etc. Colour:Photo Color Material:plastic Package Contents: 6 * DC-DC Buck Converter Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.