The 4-channel mixer with a built-in wireless bluetooth module can support high-speed bluetooth transmission. It can support most digital products with bluetooth functions on the market. Just press the mode button to switch to bluetooth mode. MP3 audio files can be loaded to the U disk. You can plug it directly into the USB slot to enjoy your favorite music at your own pace. You just need to link to your mixer via USB. Mixing consoles with flexible digital linking enables easy and fast playback of high-precision digital content. The three frequencies of the audio can be adjusted independently. The audio of the music is more vivid and the independent adjustment of high medium low frequency can make up for the lack of the vocal range in the vocal line making the vocal more full and delicate. It has built-in digital reverb effects making the vocals delicate and full responsive and precise. The knobs are all designed on the surface of the casing so that the casing the internal circuit board and the parts below it are not subject to any collision or squeeze ensuring greater stability. Impact-resistant powder-coated metal housing makes this 4-channel mixer more durable and lasts longer. The wavy and rounded design is conducive to rapid heat dissipation ensuring stable operation and extending service life. The internal design of the power module is independent of the analog circuitry helping to reduce the chance of noise generation while increasing the lifespan of the internal components. Connect headphones to monitor the level signal of each channel in real-time.