Wholesale External Backup Battery case for iphone 4

Specifications

Feature:
1.Power Switch:ON/OFF.built-in lithium battery.
2.It also can be protector of iphone4.
3.LEDs on back side for power checking&indication.
4.Using iphone 4 is available when it is being charged.You needn't take it out .
5.How to Put Your Iphone4 on Charge:First of all,please turn on the switch,When lithium battery is full of power,please insert iphone4,then turn on the switch on back side,in that case it is charging.When the lithium battery is dead,please insert USB cable into it,connect other port  with computer USB port.Now it is able to charge for lithium batter,after it is full of power,please operate as above mention.

Specificaton:
Output V: DC 5V
Output C: ≤700mA(0.7A)
Input V: 5V
Input C: ≤1000mA(1A)
Contain: 7WH(1900mAh)
Charging time: 4 to 6 hours
Working temperature: -10°C to 40°C
Storage temperature: -20°C to +50°C
Standby time: >380hours
Call time: over 6.5hours at 3G
Surfing time: over 6.5hours at 3G/over 7hours at Wi-Fi
Music playing: over 28hours
Video playing: Over 8hours
product Size: 126 x 63 x 15mm
Net Weight: 58G
package size:140*98*25mm(Blister Packing )
package weight:121.5G
package size:133*90*22mm(Crystal box)
package weight:150G  

external Backup Battery Case for iPhone4 ,Micro-USB for charging and sync,power check and indication with button and 4 LED, Surface Treatment by paint rubber, Cell Type is lithium battery,Capacity is 1900mAh.