Boytone BT-54UM with 2 wireless Digital microphone system by Boytone has dual UHF fixed frequency channel and broad audio response range with low distortion so you can enjoy cordless singing to karaoke music and mobility for energetic on stage performance Microphones provide up to 15 hours of wireless operation on a 4 AA alkaline battery included. Each microphone operates on a single separate channel in the high-band UHF range for reliable this professional portable wireless microphone set has a channel frequency range of 470~580 MHz high signal over noise ratio performance for capturing high quality audio. Ideal for professional engagement conference. Each dynamic mic features its own off & on power for a karaoke experience that both kids and adults will enjoy. Perfect for PA karaoke DJ party conference. Operating range 196 + ft. up to 300+ ft. AC Adapter 110 to 240 volt Real UHF wireless microphone system Dual Fix channel Operating range: 196 t0 260 feet (60 t0 80) meters Frequency: 480MHz‐570MHz 2 handheld wireless dynamic microphone system Rubber antenna Power Switch turn on/off Transmitter Digital screen IR Window Metal case receiver Metal case wireless microphone Balance Audio Output Connection cable Construction of high quality components of the receiver handheld microphone Simply connect the audio cable to the receiver and an amplifier or speaker In addition the volume adjustment knobs on the receiver allow you to adjust the Power adapter: 100‐240 V 50 Hz Construction of high quality components of the receiver handheld microphone Implemented with dual antennas to maximize the power of the wireless signal and guarantee the stability of the signal the volume adjustment knobs on the receiver allow you to adjust the volumes of the two microphones separately