for iPhone 4 External Battery/Battery case/Battery

for iPhone 4 External Battery/Battery case/Battery pack capacity:1500mAh standby time:up to 170 hours Talk time:up to 4.5 hours on 3G / up to 10 hours on 2G Internet use:up to 4 hours on 3G /up to 6 hours on Wi-Fi Audio playback:up to 22 hours Video playback:up to 6 hours Battery cell:Lithium-Polymer Weight: 60g Demension:128×62.8×15(mm) Charging time:3-4 hours Output voltage: 5V Output current: 500mA Input voltage: 5V Input current: 500mA Temperature:-20°C-50°C