SIMPLE OPERATION: Small and simple recording sound card, provides a simple and convenient recording process, allowing you to easily record studio sound quality. USB INTERFACE: Mixing board with USB interface, compatible with most U disk, insert the U disk can play songs, can also record songs, just put the sound files into the U disk. APPLICATION SCENARIOS: mixer has wide range of use, can be used for live, karaoke, professional recording, guitar playing, home entertainment, etc. 4 CHANNELS: Multifunctional four channel mixer, convenient for you to record playing and singing, computer internal recording, recording and arranging music. MULTI FUNCTION: Mixer with digital display MP3 (UDISKMP3 input) and function, mobile wireless connection, play music, karaoke.