Trexcell Black Thermoplastic TPU Cover Case for Motorola Droid Bionic Extended Battery Designed specifically for the Motorola Droid Bionic aftermarket extended battery and cover Access to all phone ports and buttons. Open access to speakers, microphone & camera. Manufactured from a Thermoplastic TPU. Protects your phone from falls and scratches and will NOT stretch out. Exclusive to the Trexcell 4000mAh Extended Battery for the Motorola Droid Bionic Will also fit most all other aftermarket extended battery brands with the exception of Seidio