- Reach Everyone in the Room with a State of the Art Headset/Lavalier Wireless Microphone System. A Perfect Choice for Entertainers Who Need Wireless Freedom to Move on Stage. Featuring a Rugged Yet Lightweight Design That is Perfect for All Day Use - This Listing Includes (1) Professional Audio Headset Lavalier Microphone and (1) Dual Channel Receiver. - Designed to Deliver Crisp and Clear Sound With Selectable Frequencies 517.0 Mhz Up To 521.5 Mhz. - This Wireless Microphone System is Built with a Full Range Volume Rotary for Better Sound Control and Delivery. - Provides Up to 150 Feet of Dynamic Operating Range without the Fear of a Signal Dropout.