Retekess TR503 Wireless FM Microphone Headset, Hands-Free with Rechargeable Battery for Voice Amplifier, Church, Tour Guide, Teacher, Salesman, Conference, Karaoke (Black)

* The transmission distance of 30 meters in the open air; 15 levels of transmit volume adjustable; only a portable headset FM transmitter; cannot connect to the device via Bluetooth * Built-in 450mAh rechargeable lithium battery supports up to 8h use after full charge; rechargeable and environment-friendly for long-term use * Large screen to show frequency; simply pair the FM microphone to the speaker with the same frequency and you are ready to go * USB to micro USB charging; unlike other mic which requires a unique charging adaptor; this model is using micro USB port; so you can just use your mobile charger and cable to charge it; no need to worry about losing your adapter * Widely used; teaching; tour guide; sales promotion; lectures; meetings; karaoke; fans singing and so on purpose; easily pairs to all kinds of FM supported devices such as speakers; megaphones; amplifiers; FM radio and car audio systems