This performance Workout Armband safely carries your smart phone or MP3 device while you're on-the-run. It features a large storage pocket with a smooth translucent protective cover that is sensitive to the touch, for easy accessibility to features on your phone or device. Fitted with an extra layering of water and sweat repelling material, this pocket is sure to keep your device-securely safe and snug! It can hold devices up to 5.13 in. x 3.13 in. The recommended approximate device minimum dimensions are 4.65 in. x 2.2 in. As for the band's exterior, it is made up of a Fastener strap that provides 17.4 inches of comfortable and secure grip. Designed to fit any arm it, comes equipped with a key slot for a secure hold while you run. This design is made to keep up with an active lifestyle. Use it while working-out at the gym, outdoors, or simply taking a walk.