Oenbopo Handsfree Tie Clip Head Wireless FM Microphone Mic Transmitter and Receiver Kits Tie Clip / Head Handsfree Wireless FM Microphone Mic Transmitter & Receiver Kits. Professional Condenser Wireless Microphone - Hi-Fidelity Unidirectional Microphone. Excellent Reproduction of Voice & Music. Works with most Karaoke PA outputs It brings you convenience in teaching, conference, monitoring, etc Package includes 2 microphone, one clip on lapel, one held on head. (Can't use at the same time) Install batteries into both transmitter and receiver. Switch on them, the connection will be built easily. With LED indicators Plug microphone to the transmitter, and plug the receiver to your amplifier. If it does not work normal. Use a screw to press the RESET hole on the receiver