1. mono input channel 1/2 hybrid microphone/line input interrupt. 2. 48V phantom power switch/indicator light, Single tone input channel guitar/line input toggle switch. 3. Gain knob. 4. Speaker left and right channel adjustment. 5. High, medium, and bass knobs. Volume knob and indicator. Reverb switching handles built-in quality effects and renders the sound of the channel. MP3 player and CH 3-4 channel signal switch button. Built-in good quality digital effects processor, rendering channel sound. Main output volume knob: adjust the volume of the main output. Headset volume microphone knob: adjust the output volume of headset microphone; 3. 5mm headset output interrupt. 3.5mm microphone mono input interrupt. Power indicator light. Indicator light of main output level. BT/MP 3 player. 99 different MP3 effects switching. stereo input channel input interface. Main output interrupt 6.35mm standard interrup. Lotus socket for recording output. Due to different batches, there may be differences in product appearance, color, and printed text, which not affect the use. Plug Type:EU Plug,it applies to Indonesia, Germany, France, Spain, Italy and so on. Voltage:AC100-240V Color:Black Material:ABS Package Contents: 1 * Audio Mixer 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.