Functions: or reduce the original singing voice in the song. With Bluetooth receiving function, it supports wired and Bluetooth input and can be used as a Bluetooth receiver. The Bluetooth version is 5.0, with an external antenna and a receiving distance of dozens of meters. This device adopts hardware circuits plus software algorithms, which can remove the original singing voice in the song to the greatest extent. Bluetooth Name: -2 The following issues need to be noted during use: The song must be in stereo and the volume of the left and right channels should be the same. The recording quality of the song should be good. Different songs have different recording processes, and the results of vocal elimination . This is a normal phenomenon. Specifications: Input and output interface: 3.5mm Power supply: DC5V Power consumption: 0.25W Frequency response: 20HZ - 20KHZ Input impedance: 50KΩ Output impedance: 600Ω Gain: 0db Colour:black Material:Aluminum Alloy Package Contents: 1 * host 1 * USB power cable 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.