Portable Wireless FM Transmitter Receiver Lavalier Clip Microphone Mic System Perfect for meetings, speeches, conference,karaoke, church etc. Modulation: FM; Transmit/Receive Transmitter Size: 95mm x 63mm x 22mm/3.74 x 2.48 x 0.87"(LxWxH) Receiver Size: 72mm x 44mm x 14mm/2.83 x 1.73 x 0.55"(LxWxH) Transmitter and Receiver batteries included.