Seesii Hands-free Wireless FM Condenser Microphone Headset Megaphone Radio For Speaker (FM Wireless Microphone) color: black Super multi-channel optional, will not interfere with each other optional channel 200Small and exquisite, portable, amplification function anytime and anywhere Small and exquisite, portable, amplification function anytime and anywhere Widely used: teaching, tour guide, sales promotion, lectures, meetings, karaoke, fans singing and so on purpose FM Wireless Microphone FM Transmitter 87.0Mhz-108Mhz For Teaching Tour Amplifier