The Stilo WRC Amplifier features two separate volume controls (for driver and co-driver), a specially designed shape to fit onto roll cages and special cables to attach to belts. The amplifier automatically switches on when the co-driver connects their jack plug. 9 Volt battery operation (12v available with adaptor, not included but available by clicking HERE) with a camera or car radio connection.Dual volume controls so you can find the perfect balance between driver and co-driverSpecial design for easy roll bar fittingAuto switch on is activated when the navigator's headset is plugged in the amplifierBattery not included