MTW-400 Four-channel full duplex wireless intercom main station with BK-201 wireless intercom belt pack is ideal for open occasions, including TV studio, OB Vehicle, live performance etc. The system adopts 2.4G frequency wireless transmission technology and digital module with 99 channels. To avoid interrupting outside, it can be automatic frequency hopping. The wireless intercom system is stable and reliable performance, flexible configuration, clear voice, simple operation and strong anti-interference ability.