If your device has only one microphone or inst ent interface, you can increase the number of expansion interfaces through this machine to achieve the purpose of multi-channel input. Five inputs and one output, five inputs are mixed into one output, and the volume of each channel is independently adjustable; With reverberation function, the size of each reverberation channel is independently adjustable; Input and output: 6.5mm (6.35mm) mono; Charging: TYPE C interface, DC5V, can be with a mobile phone charger; Battery: 18650 (2000mah);(Not included) Gain: 0db/10db, switch by button; Indicator light status: 4 consecutive flashes indicate 4 grids of power, 3 flashes indicate 3 grids of power, and so on, full charge and long light. Color: black Material: Metal Package Contents: 1 x Condenser Microphone Expander 1 x Charging cable 1 x 6.5mm audio line 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.