2.4G Digital Wireless, Global Free Frequency Dual Transmitters Triggered by One Receiver Visual Power, Audio Dynamic Monitor and Other Display Functions Internal and External MIC Two Input Modes Mono/Stereo Switchable Output Modes Real-time Audio Monitor Broadcasting Quality Audio RF Technology, Auto Freq. Adjustment, Stable Transmission Low Latency < 20ms Working Range Up to 50m Designed with Multi-functional Belt Clip and Compact