TP-4M 4-Channel Multi-function Professional Recording Mixer Bluetooth Sound Card Features: 1. 2-way mono inputs, 1-way stereo input. 2. RCA CD input and RCA recording output. 3. Built-in compressor and reverb effects chip; features high-precision 24-bit resolution to ensure high-quality audio and superior sound performance. 4. 99 digital reverb effects, providing the right sound for various occasions. 5. Professional 3-band EQ adjustment; each mono channel allows for independent adjustment of high, mid, and low frequencies. 6. Built-in Bluetooth module; fully compatible with smartphones, tablets, and other digital devices—connect directly via Bluetooth without audio cables. 7. USB lossless transmission; plug-and-play functionality. 8. 48V phantom power; suitable for professional condenser microphones. Specifications: 1. Power Input: AC 100V-240V, 0.2A 2. Output Level: +26dBu max 3. Common-Mode Rejection Ratio (CMRR): more than 75dB 4. Line Input Level: +24dBu 5. Frequency Response: 20Hz-20kHz 6. Microphone Input Level: +24dBu 7. Total Harmonic Distortion (THD): less than 0.01% 8. Noise: -80dB 9. Bluetooth Version: 5.0