<b>Features:</b> <br>Compatible with all iPhone 4 4S (even blocked / SIM-Lock) <br>Two SIM cards in your iPhone 4 4S <br>Simultaneous connection <br>Both SIM cards are active at the same time <br>Power extender for your iPhone 4 4S battery <br>Both SIM cards signal strenght appear on your iPhone 4 4S touch screen <br>Both battery level status are shown on your iPhone 4 4S touch screen <br>Compatible with any providers SIM or USIM cards <br>Does not require to cut your SIM cards <br>Avoid roaming charge <br>Scratchproof and shockproof <br>Unlocking your iPhone 4 4S is not necessary <br>Function Enable / Disable & Change PIN code <br> <br><b>Specifications:</b> <br>Integrated Battery: 3.7V/800mAh <br>GSM Quad Band:850/900/1800/1900Hz <br>Input/Output: 5.0V/500MA <br>Talk Time: 500min. <br> <br><b>Package included:</b> <br>1x…