VanGoddy Armband &ndash; Neoprene Sweat-proof w/ Key & ID Card Pouch for Xiaomi Mi 4 4G LTE Smartphone Comfortable on the go sweat resistant neoprene armband keeps your device hand-free Armband features small slip pocket for storing a house key Adjustable strapping and extender piece offer a universal fit | 10.5"-13inches without extender piece & 15"-20inches with extender piece Cell phone compartment measures 5.25" X 2.83" X 0.50inches