The most classic battery case for iPhone4
Optional colors:whtie/ black

Features:
-- With Apple license. Keep in line with iPone 4 design
-- Ultra thin but fully protective
-- built in 1,800mAh Lithium battery for 2 X your iPhone battery time
-- Charge and sync your iPhone w/o removing from the battery case
-- Only 1 touch button for battery indication, on/off switching
-- low self-comsumption, less than 50uA

Specifications:
-- Input: 5.0±0.5V/1.0A(Max)
-- Output: 5.0±0.25V/550mA
-- Built-in Battery Type: Lithium ion
-- Capacities: 1800mAh
-- Input: 5.0V/1A
-- Output: 5.0V/1A
-- Stand by time: Up to 300hrs
-- Talk time: Up to 10hrs
-- Internet use: Up to 10hrs
-- Audio Playback: Up to 11hrs
-- Video Playback: Up to 40hrs
-- Dimensions (mm): 125.4 * 62 * 16