Specification: Item Type: Wireless Microphone_x000D_Material: ABS + Quartz Crystal_x000D_1. Comprehensive Performance:_x000D_Frequency Stability: Less Than +30ppm_x000D_Dynamic Range: Greater Than 90dB_x000D_Total Harmonic Distortion: Less Than 0.5%_x000D_Frequency Response: 40Hz-15KHz3dB_x000D_Audio Output Level: 1. Rated Type: 0-400mV; 2. Mixing Type: 0-200mV_x000D_2. Receiver:_x000D_Power Consumption: 3W_x000D_Signal/Noise Ratio: Greater Than 90dB_x000D_False Image Interference Ratio: Greater Than 80dB_x000D_Adjacent Channel Interference Ratio: Greater Than 80dB_x000D_Receiving Sensitivity: 10dBuV (Sinad=30dB)_x000D_Voltage: 100-240V_x000D_3. Microphone:_x000D_Transmitting Power: 8.5mW_x000D_Modulation Method: FM, F3F_x000D_Maximum Modulation Degree: 25KHz_x000D_Higher Harmonics: Greater Than 40dB_x000D_Battery Specifications: Each Microphone Needs to Install Two AA Batteries (Not Included)_x000D_Use Time: 5 Hours Features: 1Multi stage high frequency and intermediate frequency narrowband filters are used to eliminate any possible interference signals. 2This machine is used to remove clutter signals, and the wireless microphone has a good appearance and is easy to use. 3The 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. 4It 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. 5The longest opening distance: 80m/262ft ideal opening distance: 50m/164ft, suitable for stage, dance hall, auditorium, classroom and home. PackageList: 2 x Microphone (Without Battery) 1 x 6.5mm Cable 1 x Power Cable 1 x Receiver