TeckNet PowerSpike S2 3200mAh Ultra-Compact Portable Mobile Phone Charger USB External Battery Pack with BLUETEK Smart Charging Technology and LED Torch for Mobile Phones and USB Devices Cutting-edge BLUETEK technology identifies compatibility with Android, Apple and other devices to optimise charge speeds of up to 1A 93% charging efficiency: This discreet power bank boasts 90% charging efficiency and an energy efficiency rate 5-10% above other 3200mAh batteries 3,200mAh capacity adds more than a full charge or 11 hours of additional talk time. Most phones will benefit from 1 full charge or 108+ hours of audio playback Compact and lightweight design fits easily into your pocket or bag. With LED torch Constructed using LG Grade A cells and premium quality microchips. 3 LED power status indicator system