USB AA Battery Emergency Charger for IPHONE / IPAD / IPOD - White (5V)
2 x AA batteries. Nulit-in protction circuit when lithium batteries use up or equipment batteries charging full charger automatic turnoff and stop. Built-in DC-DC booster circuit the conversion efficiency is 88% ~ 93%. Can not use more than 1.6V 10440 14500 etc battery or it will burn out