1. MOMIX PRO is an audio mixer for portable devices' recording and live streaming, you can connect it to microphone, guitars, keyboard, electronic drum sets and more, and 2 stereo line-level input Jacks for your multi-media equipments. 2. Just set up the instruments, vocal volume of the MOMIX PRO and select the magnitude of REVERB effects properly, connect the headphone or amp to it, and it can monitor well. MOMIX PRO features built-in lithium battery, you can also charge your smart phone via MOMIX PRO when it's been simultaneously, facilitating live streaming or recording outdoors, your smart phone have much longer battery life. 3. When you're composing songs or want to use guitar tone apps, just turn on GarageBand or similar types of apps, and use it with MOMIX PRO, besides, MOMIX PRO is suitable for singing and live streaming, just turn on MOMIX PRO's CENTER CANCEL function and reduce the vocal volume of playback music, making your vocal prominent. 4. If you need audio-to-video synchronization, MOMIX PRO can output the stereo audio to your smart phone in real time, it's perfect for composing songs, live streamer's instrumental performance, karaoke, musicians' recording performances, making the present music performance much more convenient and versatile! Colour:White Material:Plastic Package Contents: 1x USB Sound Card Audio Mixer Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.