MMRM Black Silicone Phone Edge Frame Fitted Bumper Case Cover for iPhone 6 6S 4.7" Material: Flexible Silicone Use rechargeable lithium polymer battery. Integrated power switch allows you to switch on/off the battery case. Only use the battery when you need it. We can provide custom phone cases with any design for you. If you want, please contact us! Easy Access to all device ports and controls