Item Type: Karaoke Bluetooth Microphone Material: ABS Microphone Built in Battery: Lithium Battery 500mAh Pickup: Condenser Type Reverb Mode: Sound Effect Reverb Transmission Distance: About 10m/32.8ft (Barrier Free Distance) Operating Frequency: 2.402G-2.480GHz Receiving Sensitivity: -85dB Signal to Noise Ratio: ≥80dB Distortion: ≤3% Output Power: 8W Charging Time: About 2-3 Hours Play Time: About 5-6 Hours 1、Compatible System: Bluetooth microphone is compatible with all kinds of APP, compatible with many cell phone Karaoke live software on the market, free to sing.  2、One Key Switch:  Karaoke  Bluetooth microphone original singing accompaniment with you to switch, the music in seconds into the accompaniment song, at any time to enjoy K songs.  3、Acoustic Earphone Monitoring: Wireless handheld microphone can be real time earphone monitoring, Karaoke recording, intelligent monitoring, real time earphone, while singing and listening.  4、DSP Noise Reduction: Kids microphone clearly restore the sound quality, the use of digital processing technology to restore, reduce noise, the human voice clean and clear.  5、Compact and Convenient: Bluetooth handheld microphone is small and long lasting, with less than 500g weight, you can carry it around and sing for 6 hours on a full charge.