Display channel selection: Press the switch button to set your favorite channel display as needed, both sides are fully illuminated as stereo, left is left channel, right is right channel (if you want the two lights to display consistent, not set For stereo sound); Music light display speed adjustment mode: Adjust the gain effect and the audio beat speed. Gain adjustment: After the automatic adjustment gain is turned on, the device will enter the gain automatic adjustment mode, and the device will adjust the gain according to the actual volume to achieve a suitable display effect (if you want the best display effect, it is recommended to manually adjust) Gain adjustment mode: Press the switch button to set the appropriate gain effect according to your favorite tone to achieve better display effect (when the auto adjustment is turned on, the setting is invalid); Parameter adjustment and button description: Set button press to switch parameter setting interface Material:Metal + plastic colour:black Package Contents: 1 set stereo amplifier(The accessories are shown in the picture) Only the above package content, other products are not included. Note: Light 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.