Features: Plug & Play: This wireless microphone system comes with a mini portable receiver with a 6.5mm/ 1/4inch output, which is easy to install with your speakers, mixer or amplifier. The microphone can be turned on when Automatically pair with receiver and hassle-free Echo/Treble/Bass effect: You can easily adjust the echo, treble or bass to your desired level with the buttons on the microphone; suitable for karaoke, conference, speech, wedding, church, etc.; cardioid pickup emphasizes the main sound source and minimize background noise. Even better, the handheld mic is rechargeable and has a sturdy metal body that can withstand heavy use. No Interference: Ultra High Frequency (UHF) microphone system minimizes radio frequency interference and noise from other electronic and digital devices. Provides wireless freedom, ease of use and 50 discrete UHF frequencies for contactless operation (supports up to 50 microphones simultaneously without interference, RF range: 673.5Mhz-694.9Mhz) Full Compatibility: Mic receiver with 1/4inch (6.5mm) output and compatible with most mixers and amplifiers with 1/4inch input jack Compatible with more devices. The system has a range of up to 50m/164 feet Rechargeable Handheld Microphone: Built-in 2500mAh high-capacity lithium battery, use the USB charging cable to easily charge the microphone, say goodbye to the trouble of removing and inserting the battery. Plug and play, just charge Specification: Pickup Type: Moving Coil Sensitivity: -35dBm/10 dynes /c㎡ RF range: 673.5Mhz-694.9Mhz Number of channels: 50 (support 50 microphones at the same time without interference) Frequency Response: 40Hz-18Hz Distortion: Less than0.3A% weighted 1KHz Output power: Greater than8dBm Offset: ±40KHz Harmonic radiation: Less than-50dBm Maximum input sound pressure: Greater than 130dB SPL THD Less than 1 % Signal-to-noiseratio: Greater than 100dB (A) U-segment