Fangrui Product Details 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: 18650 (2000mah), Removable 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