Doros wt91x Pro are tough, waterproof walkietalkies that work in environments other radios cannot. The range of these walkietalkies depends on where you use them. The Doro wt91x Pro can reach a range of up to 10 km outdoors and up to 600 metres by buildings. The wt91x pro are great for taking on all your adventures. They have an automatic channel scan mode for high quality voice transmissions, and are relatively compact so theyll fit perfectly into your pocket.