1. Noise Reduction: With a smart noise control chip, audio processing is faster and more stable, making the input sound voice more clear, with a stable signal, nice sound quality, and without delay, ensuring high-quality sound, and singing beautiful songs. 2. Bluetooth: Support Bluetooth 4.0, accompaniment music can be transferred via mobile phone, free from the shackles of wires.Support to connect 2 mobile phones or computers at the same time. 3. Portable: About 157x78x15mm/6.18x3.07x0.59inch. It's the same size as a mobile phone, and easy to carry. Built-in rechargeable battery, you can continue to live to reach more than 5-8 hours. 4. Multi-applications Sound Mixer Board: A variety of live control sound effects, sound modes, and adjustments, professional control, and easy to use. It can be used for DJ, music studio recording, karaoke online, podcast, singing, k song, live streaming, online chat, etc. 5. Wide Compatibility for Mobile Phone and Computer: changer machine can be compatible with PC, Computer, Tablet, Android phone, Type C devices, , and electronic musical instruments. Perfect for broadcast, karaoke, studio music recording, and more. Model:V300 Pro Built-in battery capacity:500mAh Bluetooth-compatible version:4.0 Working time:5-8h Application:mobile phone, computer, special for recording Note:Due to different product batches, the appearance , which does not affect the use. Colour:Black Material:Plastic Size:15.7x7.8x1.5cm/6.17x3.07x0.59inch Package Contents: 2 x Live Sound Card 2 x Charging Cable 2 x Live Streaming CABLE 2 x Accompaniment Cable 2 x English Manual 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.