Features: MINI SIZE: Compact in size and light in weight, even smaller than a mainstream smartphone, which means the sound card is easy to carry without looking bulky, adding few weight to your pocket or backpack. RICH CONNECTION: Four 3.5mm audio interfaces for different functions: headset to monitor, microphone to input voice, phone to receive voice and accompaniment port to polish your live streaming or recording. Plus, BT wireless connection is supported. NOISE REDUCTION: Smart noise reduction to shield picking up ambient noise for pure singing input and output, meanwhile the low-latency sound monitoring allows you to correct your singing at real time, effectively avoiding singing out of tune. SOUND EFFECT: Built-in DSP, up to 9 interesting sound effect and 12 autotunes are supported, by simply pressing the buttons to add interesting sound to your live streaming and modifying your voice to make singing more easy. LARGE BATTERY: Built-in 1000mAh rechargeable lithium-ion battery, which is able to powers your pleasing entertainment time with the sound card up to 7 hours. With Type-C charging port, convenient to charge the sound card, even with your phone charging adapter. Charging while playing is supported.