The name says it all� It holds tight and works with almost every smartphone having a 4.5` to 5.5` screen with or without a case High quality, ultra-elastic silicone grippers tenaciously hold your phone for convenient display The Omni RideCase is compatible with other RideCase QuickClick� mounts, like the RideCase CarMount or RideCase Armband Running kit includes the Topeak Armband made from medical grade elastic and silicone grip strips to keep it comfortably in place Fits phones w/ 4.5 - 5.5` screens Black