It isbuild in 1800mAh Polymer Lithium-ion back up. It offers you the full protection of a hard-shell case while providing virtually twice the battery life of the iPhone alone and your ipad full one time; all in an ultra-thin, light-weight, low-profile design.

Build-in earphone back up power

1) Battery capacity: 1800mA/3.7V (Polyma Lithium-ion battery)

2)  For Iphone 5

3) Output: 5V 1000mA each

4) Input: 5V/1000mA

5)  Earphone wire length is 105CM,could use more than 30000 times drag/back.

Features
1.Retractable earphones:
1)For listening and taking (Microphone include),easy on/off feature gives your choices to use the earphone or not.
2)Earphone wire extends to maximum length of 105cm,can sustain more than 30000 pulls,which equals about 3-4years of normal usage.
3)Two types of ear-bud selections featuring stereo sound,let you enjoy to listen music and watch video.
2.Built-in 1800mAh rechargeable battery
1)Nearly doubles the usage and standby time of your iphone5,use it as a backup battery to charge your iphone5 on the go.
2)LED indicator lights provide easy tracking of current battery life status.
3)Easily charge and sync your iphone5 while simultaneously charging the sotex case-all without having to remove the case.
3.Protective phone case
1)Excellent iPhone5 protection.
2)Made of high quality,durable materials,precision molded for a perfect fit.
3)Openings for buttons,switch,camera and speakers.
4)Easy to assemble with your iPhone.

Compatibility
It is compatibility with the IPhone 5.It is not to be used with any other devices.

Recharging
1.It will charge the IPone5 first,then charge the case,when the Iphone5 and battery case are plugged in.
2.To charge the iPhone5,from the battery case,press and hold the button on the side of the case for 2 seconds.The battery case will then charge Iphone5 when there is no outside power.
3.Recharging the battery case directly:Plug the original iPhone5 AC adapter into the battery case to directly recharge it.
4.One charge of our built-in 1800mAh rechargeable external battery available about nearly doubles the battery life of your iphone5,giving you the freedom to enjoy your mobile lifestyle without worrying about when the next power outlet will be aailable.

3.Fast delivery