Cardo scala rider Q3 Bluetooth Motorcycle Headset and Bike-to-Bike Communication System, Dual Pack (Discontinued by Manufacturer) Bike-to-Bike intercom between 4 riders (toggling) with range of up to 1,100 yards in full duplex Interchangeable microphone options included. Can be used with your choice of speakers (standard 3.5mm) iOS (iOS available late May 2017) and Android cardo smart set App for full remote control ability and device customization Self-adjusting speaker volume according to ambient noise Waterproof and Dustproof