CL-600B Stereo Bluetooth Karaoke Power Amplifier Product Information. Independent research and development of Bluetooth HiFi karaoke amplifier. Support a variety of input methods: Bluetooth, RCA input, HDMI ARC input, fiber input, USB speaker, U disk playback. With karaoke function, support BASS/TREBLE adjustment, microphone volume/reverb intensity adjustment. Equipped with LCD screen display and operated by infrared remote control. Support high and low sound adjustment, including anti-howling, reverberation intensity adjustment, high and low sound adjustment, and two rows of microphones. Support HDMI (ARC return), the TV sound can be transmitted back to the power amplifier through HDMI-ARC, and then output to the speaker through the power amplifier. Support USB speakers, use Type-A to Type-C cable to connect the sound card to the computer, wait for the system to complete the update, and set the computer's playback device to "Audio Streamer" to play music. The Bluetooth version is 5.0. Product Name: CL-600B Stereo Bluetooth Karaoke Amplifier Audio input: Bluetooth 5.0/RCA input/HDMI ARC input/fiber input/USB speaker/U disk playback Audio output: SPEAKER R + L/RCA stereo output/RCA bass output Working voltage: DC 24V - 3A Output power: 2 x 50W (4Ω) Frequency Response: 20Hz - 20kHz Harmonic distortion: 0.03% Signal to noise ratio: 95dB Audio decoding: MP3/WMA/SBC/WAV/FLAC/AAC/AIF/AMR/APE Audio input: Bluetooth 5.0 RCA input HDMI ARC input fiber input USB speaker/USB flash drive playback Audio output: Left and right channel speaker/stereo output RCA output Subwoofer output Working voltage: DC 24V - 5A Output power: 2 x 50W (4Ω) Frequency Response: 20Hz - 20kHz Less than ± 2dB Total Harmonic Distortion: 0.02% Signal to noise ratio: 9