Wireless System: UHF wireless microphone produces clear sound without distortion. The microphone display shows the battery level and signal strength in real time. Signal stability: The high-sensitivity professional dynamic microphone extends the working range to 30m, which solves the problem of tangled wires. UHF wireless microphone with built-in cardioid pickup pattern provides a clearer signal and better sound quality, reducing the chance of interference and dropped calls. Plug and Play: Just plug the receiver into the MIC jack, the receiver automatically sync its frequency with the microphone, batteries, adapter plugs/cables and other accessories are included in the package and ready to use when you receive it. Suitable for karaoke machines, mixers, jukeboxes, audio amplifiers, PA systems, powered speakers, voice amplifiers, truck speaker systems. (The glowing part of the product in the picture is the light effect; the actual product may have color difference due to different light or display, but it not affect the use) Output impedance: 580 (15%) Sensitivity: -553dB(at1KHz)(0dB=lmV/Pa) Pointing characteristics: unidirectional Frequency response range: 50-15KHz Audio signal: digital sampling Pairing method: Automatic pairing Frequency:2350MHZ-2483MHZ Voice frequency: 20Hz-20kHz Use distance: about 30 meters Audio output: Mixed output mission mode:two-way frequency hopping Receiver Power supply: built-in 1100mAh14650 battery Microphone Power supply: built-in 1200mAh18650 battery Battery life: 4 hours for red, blue and green,3 hours for other colors Color: As shown Material: plastic Package Contents: 1 * Receiver 1 * wireless microphone Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.