Features: UHF one channal wireless transmission, providing clear sound. Widely compatible with smartphones, digital SLR cameras, camcorders, voice recorders, and computers, etc. DSP digital audio companding, using 48KHz audio sampling rate to minimize the noise in the wireless transmission system. Support USB cable charging. The transmitter has a built-in microphone and supports an external lavalier microphone. Multiple switchable frequency points to realize operation without environmental interference. One-button switch and search frequency points. Use LED lights to display the corresponding product status. The receiver and transmotter are both powered by 500mAh battery for long working time.