1.Wide use of noise reduction: live sound cards have a wide range of applications. Can be used on a computer or smartphone for entertainment such as live streaming or karaoke. 2.Multiple connection methods for portable live sound card: Mini live sound card supports Bluetooth connection and cable connection. But the Bluetooth function only supports device accompaniment. You can turn on your phone's bluetooth, then search for and connect the K9. The indicator light will be on after successful pairing. 3.Multiple sound effects noise reduction of the mixer board: The live sound card supports noise reduction. Even in a noisy environment, it can create favorable conditions for sound quality and provide a good singing experience. 4.Mixing board Multiple sound effects Multiple sound effects: The live sound changing card has 13 electronic sound effects and 9 live sound effects. You can adjust it to your liking for .