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