Main Features:● Compact and beautiful: Mini transmitter and receiver， easy to carry. Can be put in bag● Excellent sound effect: You will receive good teaching effect when used in class● Simple operation: The receiver can be plugged in any amplification device which microphone can be used● Widely used: Suitable for teaching， lectures， guide， driver training， dance training， meeting， performances and home entertainment and other occasions， especially perfect for those who needs often go out to give lectures or the scene where there are amplifier and speaker● Monomer structure: Dynamic● Receiving distance: 30 - 50m● RF carrier frequency: 210 - 270MHz● Output power: 6W● Distortion rate: 0.3 percent● Pickup type: Condenser● Impedance: 600 ohm● Power supply: 9V battery ( included )Type: WirelessConnection: 3.5mmPolar Pattern: Omni-directionalFrequency Range : 50 - 18 KHzSensitivity Range: 90dBPackage weight: 0.74 kgPackage size (L x W x H): 24.500 x 20.500 x 7.500 cm / 9.646 x 8.071 x 2.953 inchesPackage Contents: 1 x Headset Microphone， 1 x Clip-on Microphone， 1 x Receiver， 1 x Transmitter， 1 x 3.5mm to 1/4 inch Adapter Cable， 2 x 9V Battery， 1 x Antenna