Cases for iPhone 4, with Mobile Power Pack, Apple's iPhone Access and Dual SIM

[pioneer]

Cases for iPhone 4, with Mobile Power Pack, Apple's iPhone Access and Dual SIM Adapter Case
Key Specifications/Special Features:

    Two phones (FM01) is a portable battery case making your iPhone4 come with dual SIM dual standby, double capacity and endless talking
    It's the perfect partner for Apple's iPhone 4 and the top choice for businessman
    We are the only manufacturer of this item and first one
    It is almost a mobile just without screen
    Backup changeable battery
    Various bumpers colors are available
    It comes with almost all important functions
    Features:
        GSM dual bands: 900 to 1800 and 850 to 1900MHz
        Battery: lithium-ion 3.7V and 800mAh
        Input and output: 5V and 500mAh
        Talking time: 500 minutes
        Standby: 288 hours
        Colors: black and white
        Dimensions (L x W x D): 126 x 61.8 x 16.3mm
        Weight: approximately 59g
        Phone call
        Instant message
        Call waiting
        Backup battery
        Protective case