The TomTom Rider blocks outgoing calls when the bike is moving for "safety reasons" but allows incoming calls, automatically routed to your earpiece. The Rider also features a simplified, "ride mode" four-icon menu system that helps you focus on the road while you're moving. The Rider has a 3.5-inch (diagonal) screen, is sturdily built, waterproof, and may be mounted in a car with an accessory mounting kit.