NVPPXV Universal Portable USB Emergency 2 AA Battery Extender Charger Power Bank Supply Box

Features: This AA Battery Extender has the power you need to keep your Smartphone running during your air travel camping road trips or anywhere else you could face the prospect of a dead battery High power efficent regulated output for Power and Charging your Smartphone Mechanical safety design protecting your Smartphone from insertion of batteries with reversed polarity LED power indicator Pocket-sized for easy carrying Specifications: Quantity: 1pc Uses two AA batteries (batteries not included) Size: approx. 8 x 3.3 x 2.1cm Built-in DC-DC boost circuit conversion efficiency is 88%~~93% Input Voltage: 2.0-3.0V Output Voltage: 5.0V Output current: up to 700mA