DC-DC Step-Up 3V DC Booster to 5V Regulated input voltage: 2.5-5V Output Voltage: 5.5V Output current: 1000mA (max) Size: 28 x19x 8 mm - Standard USB interface, can general all use USB charging of mobile phones, MP3, MP4 and other equipment, perfect IPHONE support of mobile - Can be modified by fixed resistance adjust output voltage, highest can adjust to 12 v output, but wants to make sure that the output power within the 5w