1、Noise Filtering: Professional dynamic microphone core, special added sound filter cotton canister to filter out the noise, so that the sound output more clear. 2、Stable Signal: Dynamic microphone signal transmission is stable and interference free, and the effective receiving distance is up to Approx. 50meter/164ft. 3、Automatic Connection: Mini portable receiver, automatic connection to the microphone when open, easy to use. 4、Plug and Play: Rechargeable microphone wireless is suitable for most 6.5mm and 5mm voice frequency devices, plug and play, very convenient. 5、Metal Mesh Head: Karaoke mic adopts metal mesh head, which can better defend the microphone core from damage. 2 x Microphone1 x Receiver1 x User Manual2 x Anti Slip Cover1 x 3.5mm to 6.5mm Connector1 x Charging Cable Item Type: Wireless Dynamic MicrophoneMaterial: ABSModulation: Fixed FrequencyFrequency Range: 700 to 800MHzPreset Frequency: Auto PairingFrequency Response: 50Hz to 15khzMaximum Frequency Deviation: ±50KHz (With Level Limit)Distortion:≤ 0.01%Signal to Noise Ratio:≥98DBEffective Reception Range:≤ Approx. 50meter / 164ftRF Carrier Stability:+ 0.005%(-10°C to 50°C)Battery Type: Lithium BatteryReceiver Battery Type: 1x18650 Battery (Not Included)Handheld Microphone Battery Type: 1x18650 Battery (Not Included)Microphone Carrier Frequency Power: 30mW