Main Features:�� Just connect the receiver to any amplifier and you can communicate wirelessly up to 20m�� Clip-on microphone or cordless headset mic both can free your hands when you speaking�� Modulation: FM Transmitter / Receiver�� Perfect for meetings， speeches， conference， karaoke， church etc.�� Compact portable design， enjoy the freedom of wireless speaking�� Including two kinds of microphone (a head-worn microphone and a clip-on microphone) for your random selection �� Transmitter power: 1 x 6F22 9V battery ( included ) �� Receiver power: 1 x AAA 1.5V battery ( included ) Type: WirelessConnection: 3.5mmFrequency Range : 80 - 12.5KHz Sensitivity Range: -52dBPackage weight: 0.381 kgPackage size (L x W x H): 26.000 x 17.000 x 7.000 cm / 10.236 x 6.693 x 2.756 inchesPackage Contents: 1 x Headset Microphone， 1 x Clip-on Microphone， 1 x Wireless Transmitter， 1 x Wireless Receiver， 1 x 1.5V AAA Battery， 1 x 6F22 9V Battery