UHF dual-channel receiving design, and microphone and receiver adopt infrared synchronous frequency matching function. The receiver is equipped with a 6.35MM plug, which is plug-and-play. The characteristics of being light and portable and cost-effective will effectively replace large receivers and become for home entertainment, small conferences, outdoor audio and other occasions. The handheld microphone adopts an all-aluminum alloy handle with latest generation of KT chip transmission line design to the stability of transmission signal. It has a stable and wide frequency response curve with a customized dynamic sound , clear and natural treble, powerful mid-frequency, and low frequency. The handheld microphone has multi-functional adjustment performance (including , high and low frequencies, and volume). The microphone uses LCD display, and usage status is clear at a glance. The ideal distance is more than 50 meters, and 30 meters in complex environments. Receiver:Frequency range: UHF 640-690MHz (A.B 100 channels each, total 200 channels) Frequency stability: ±0.05% Dynamic range: 90Db Modulation mode: FM (frequency modulation) Frequency response: 60Hz-15KHz Signal-to-noise ratio: equal 90dB Adjacent channel interference ratio: 80dB Image interference ratio: 80dB Usage range: equal 50 meters Meters (open area) Receiver power supply: 18650 rechargeable battery (3.7V/1300mA) Transmitter (microphone): Carrier frequency: UHF640-690MHz (adjustable in frequency bands) Frequency stability: ±25KHz Signal-to-noise ratio: 105 dB Dynamic range: equal 100 dB Type: dynamic or capacitive Polarity mode: single direction Frequency response: 70Hz-13KHz Microphone sensitivity: -47±3dB 1KHz Power supply: DC 3V (1.5VAAx2) note: The color and appearance of battery are random, and battery does not accept specified appearance and color. The color of slip ring and USB cable is random, and slip ring and USB cable do not accept specified color. Colour:Black Material:Aluminum Alloy Package Contents: 2 x Wireless Microphone 1 x Receiver 4 x AA Battery(The battery color is random, no specified color is accepted) 1 x 18650 Battery(The battery color is random, no specified color is accepted) 1 x USB cable(The color random, no specified color is accepted) 2 x slip ring(The color random, no specified color is accepted) Only above package content, other products are not included. Note: Light reflection and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.