Muvit VOLT Powercase for the iPhone 6/6s is a casual rugged case with an extended backup battery. Added protection around the sides and corners provide extra drop protection, while the extended backup battery goes well beyond double your talk & web time. Four light charge level indicators keep you informed of your charge level, and the case accommodates both charging and cable syncing. HOW TO USE:The Muvit VOLT Powercase is easy to use, you can either charge the Powercase alone or together with the iPhone 6/6s. Simply connect it to an AC power adaptor or computer using the supplied Micro USB cable, the iPhone 6 will be charged to 100% first and then the Powercase will be charged after. The 4 light charge level indicator shows the power status of the case in increments of 25% (4 lights = 100%). Charge up the iPhone 6 by holding down the power switch located on the back of the case and it will automatically start charging, repeat this same step to stop charging.