Feature:1. Multi stage high frequency and intermediate frequency narrowband filters are used to eliminate any possible interference signals.2. This machine is used to remove clutter signals, and the wireless microphone has a good appearance and is easy to use.3. The microphone is equipped with a voltage indicating circuit, which can tell you whether it is necessary to replace the battery, there is a specially designed circuit switch on the phone, the damage range is reduced.4. It can also reduce noise, avoid external interference, turn on the mute system, select high quality chipsets and high quality components, and the sound is very good.5. The longest opening distance: 80m/262ft ideal opening distance: 50m/164ft, suitable for stage, dance hall, auditorium, classroom and home.Specification:Item Type: Wireless MicrophoneMaterial: ABS + Quartz Crystal1. Comprehensive Performance:Frequency Stability: Less Than +30ppmDynamic Range: Greater Than 90dBTotal Harmonic Distortion: Less Than 0.5%Frequency Response: 40Hz-15KHz3dBAudio Output Level: 1. Rated Type: 0-400mV; 2. Mixing Type: 0-200mV2. Receiver:Power Consumption: 3WSignal/Noise Ratio: Greater Than 90dBFalse Image Interference Ratio: Greater Than 80dBAdjacent Channel Interference Ratio: Greater Than 80dBReceiving Sensitivity: 10dBuV (Sinad=30dB)Voltage: 100-240V3. Microphone:Transmitting Power: 8.5mWModulation Method: FM, F3FMaximum Modulation Degree: 25KHzHigher Harmonics: Greater Than 40dBBattery Specifications: Each Microphone Needs to Install Two AA Batteries (Not Included)Use Time: 5 Hours.Package List:2 x Microphone (Without Battery)1 x 6.5mm Cable1 x Power Cable1 x Receiver