tested and found Will only pair with one transmitter and that transmitter and receiver will not communicate.. so one will work. not sure whats wrong with the other one. no returns on this item Get ready for a top-notch experience with the Alvoxcon TG220s Dual UHF Wireless Headset Lavalier Lapel Microphone System. This high-quality device boasts a sleek gray color and is suitable for live performance. It features wireless connectivity and an omnidirectional polar pattern, ensuring top-notch sound quality. The small diaphragm size and lavalier/lapel form factor also make it an ideal choice for those who value convenience. This Alvoxcon model comes with a host of features, including UHF wireless connectivity and a manufacturer's warranty. With this microphone system, you can rest assured that your performances will be nothing short of amazing. Whether you're a professional or an amateur musician, this device is sure to exceed your expectations.