6 channels can be input and mixed output at the same , there are 2 output interfaces that can be connected to two amplifiers or other equipment, and the volume can be adjusted independently. 6.5m large two-core interface, which can be connected to a microphone or musical instrument, with a magnification of about 5times (14db). Support mono/stereo switching, can form mono six-in and two-out or stereo three-in and one-out. Built-in lithium battery, it can be used continuously for about 30 hours when fully . The charging interface specification is 3.5x1.35, and it can be with a USB cable. Type:Signal Mixer Board Colour:Black Material:aluminum alloy Package Contents: 1 * Headphone Amplifier 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.