IPPEEL Dual SIM Battery Charger Power Case for iPhone 4 -White

Turn your iPhone 4 in a much functional device for your active lifestyle!
The IPPeel is a perfect all-in-one accessory for your iPhone 4. The case has a SIM card slot built into the inside of the back cover that let you activate two SIM cards, make and receive phone calls on two different carriers.
The device works specifically with the iPhone 4. It features a TF card slot, supports Bluetooth, and FM.
Moreover, iPPeel also contains built-in battery that powers the dual SIM operation. Once the iPhone 4 battery gets low, you can use the IPPeel to recharge your iPhone and continue to use the second SIM card.
The dock connector port allows you to charge both your iPhone and the IPPeel's batteries at the same time.
Features: 
Ultra-slim 6.8mm
Protective case
Receive/make calls
Offers SMS/text messaging
Dual SIM/standby
High capacity battery
Multi-input method support
All-in-one case accessory
Perfect fit for iPhone 4
Specifications:
GSM: Tri-band 900/1800/1900MHz
LCD: 1.8" TFT
Languages supported: 18
Messaging: SMS 1000
Contacts: 1000 group
Battery capacity: 800mAh
Other features: FM, Bluetooth
Connectivity: GPRS/WAP
Dimensions: 116 x 61 x 6.8mm
 
Package included:
1 x IPPeel Dual SIM Battery Case
2 x Li-ion Batteries
1 x Dock Connector Cable(iPhone not included)