DC-DC Converter Step Up Boost Module 3V to 5V 1A USB Charger for MP3/MP4 Phone Module Properties: non-isolated step-up module (BOOST) Input voltage: 2.5-6V Output voltage: 4-12 V (Adjustable, the default 5 v) Output Current: the maximum 1000mA Package Content: 1 x DC-DC Converter for MP3/MP4 Phone