External Portable Rechargeable backup battery for HTC Arrive HTC EVO Shift 4G HTC Free Style HTC ThunderBolt HTC Inspire 4G 4 LED charge status indicator always let you know the remaining power 1 USB and 1 Micro-USB interface, universal useage for iPhone, iPod, Blackberry, HTC, PSP etc. Build-in Short circuit, overcharge and terperature protection With included cable, easy to be recharged by normal computer, laptop,wall charger, car charger,etc Low self-consumption, less than 50uA