Features: * Easy talking with friend by wireless PTT Button, just like walkie talkie, no need pairing, effective distance is up to 10 meters. * Intercom communication distance between every two riders is up to 1-3KM in the open place. Water-resistant device, suitable for outdoor activities. * No limit for the user quantity for every channel, you can communicate with as many companions as you need, very suitable for group intercom. * Supports Bluetooth function, you can receive or reject calls by pressing PTT button only, but cannot hear music or GPS information. * Built-in 850mAh rechargeable battery ensures up to 8 hours of intercom talk time and 29 hours of standby time per charge cycle. Note: People in the same channel can talk with each other. One person can join in several channels to talk with other person in different group.