If the device has only one microphone or musical instrument interface, this unit can be used to increase the number of expansion interfaces, achieving the goal of multi-channel input It has five inputs and one output. The five-channel input is mixed into a single-channel output, and the volume of each channel can be adjusted independently It is equipped with a delay reverb function, and the reverb volume of each channel can be adjusted independently Input and output: 6.35mm 1/4 inch mono interface Charging: TYPE C interface, DC5V, and it can be using a mobile phone charger Battery: Without Battery Gain: 0dB/10dB, switched by a button switch Indicator light status: Flashing continuously 4 times indicates a 4-grid battery level, 3 times indicates a 3-grid battery level, and so on. It stays on when fully Color: black Material: plastic Package Contents: 1 x Microphone Extender 1 x Charging Cable 1 x 6.5MM Audio 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.