Extend the battery of your Apple Watch by 2.7X with the Reserve Charging Strap for Apple Watch. This means it will give your watch 30 additional hours of usage. It is a specialized thermoset elastomer silicone band which comes with a proprietary overmolded accessory port connector. The strap adheres to Apple’s official band design guidelines and has been embedded with lithium polymer cells. There’s a micro USB charging port and an LED charge status indicator. The strap is water resistant too and supports either 38mm or 42mm Apple Watches. There’s a one touch charge indicator too. Available in white, grey, black and infrared colors, this strap makes your Apple Watch a powerfully charged up device for your wrist.