F4 Home 4-channel Bluetooth USB Reverb Mixer, US Plug (Black) 1. Metal shell design, more anti-interference! Fashionable appearance, exquisite and beautiful! The metal shell uses an impact-resistant powder coating process to make the machine more anti-drop and durable. 2. The small mixer has four input channels, and each channel has independent adjustment of high, middle and bass, gain adjustment, reverberation adjustment, etc., even for inexperienced new users, after a period of familiarization, they can call up a satisfactory sound. 3. The built-in Bluetooth wireless module makes the connection distance no longer restricted. High-speed Bluetooth transmission supports the connection of most electronic digital products with Bluetooth modules on the market. 4. You can copy MP3 audio files into a USB flash drive, and plug it directly into the USB socket next to the display! Press the MODE button to switch to the USB flash drive mode, and press the play button to play MP3 format music! 5. The 4-channel mixer has a wealth of input and output interfaces, which can be connected to a variety of audio equipment, such as: wired and wireless microphones, electronic keyboard computers, power amplifiers, active speakers, etc.! 6. When playing on different occasions, professional digital calculation can adjust the authenticity of the sound effect, making the music fuller and the sense of space stronger. 7. Output level: +26dBu(max) 8. Common mode rejection ratio: greater than 75dB 9. Line input level: +24dBu 10. Frequency response: 20Hz-20KHz 11. Topic input level: +24dBu 12. Total harmonic distortion: less than 0.01% 13. Noise: -80dB