Rockville RWM-4Z Quad Wireless UHF Handheld/Headset Microphone System 20 Channel
Rockville RWM-4Z Quad Wireless UHF 4 Microphone System w/Adjustable Frequency. Modulation Mode: UHF. The display on the receiver shows RF signal strength, AF signal strength, frequency channel, battery life of each handheld mic.