Vangoddy Waterproof Workout Armband for Smartphones with Key Slot - Retail Packaging - Green Soft-touch neoprene case hold your device securely. Fastener strap to secure excess headphone cord. Waterproof backing. Slit in back for a key. Removable extra 7.5 in Fastener strap to make length even bigger. Great for use while working out. Compartment Dimensions: 5.75 in. x 3 in. Armband length without extra strap: 15 in. Armband length with extra strap: 22 in.