1MINI RECEIVER: The USB power supply design can supply power as long as it is 5V, and it can be powered by computers, power banks, etc., and the battery life is long lasting. 2LONG LASTING: This portable microphone and receiver are made of strong aluminum alloy, which has strong impact resistance and corrosion resistance. strong and sturdy. 3MULTI CHANNEL GROUP FREQUENCY POINTS: Can also manually tuned. When multiple sets of machines are used on the same occasion, different frequency points can be selected to avoid interference cross frequency. 4COMPATIBLE: The microphone has an operating range of 330ft, super strong signal stability, suitable for most o equipment with 6.5mm interface, plug and play. 5FILTER NOISE: The professional imported dynamic microphone core is used to restore the human voice, and the special filter cotton can filter out the noise, so that the output sound is clear and pleasant. Item Type:WirelessUHFMicrophone Material: Aluminum Alloy Modulation Method: Digital Frequency Modulation Frequency Range: 700mhz-800mhz Receiving Distance: Approx. 20m-100m/66ft-328ft in Open Area Frequency Response: 50hz-18KHZ Signal to Noise Ratio: >90dB Distortion: 0.5% at 1KHZ+ Output Level: 200MV 5MV Wireless Receiver Battery Type: 1 x 18650 Battery(Not Included) Microphone Battery Type: 2 x AA Batteries (Not Included) 1 x Microphone 1 x Charging Cable 1 x Receiver 1 x Sponge Cover 1 x Manual Battery is not included.