... it Features:material: Aluminum alloy + plasticfunction: portable power supplycolor: blueapplication:Suitable for mobile phones,MP3&MP4 ... Input charge and charge complete status indicator. Output power supply and battery capacity indicator.3. Press switch key, ... products, it will firstly use the power from the portable power supply.5. Controled by chip, protect the ... -20°C~50°C Portable power supply