Audio In
                              
                              
                                  MIC 1: -28 dBV, 2.57 KΩ, unbalanced, 6.35 mm jack, supports dynamic microphone connection
USB 2.0 × 1 
RCA in 1:  0 dBV, 5 KΩ, unbalance, RCA pin jack
Bluetooth
                              
                           
                      
                          
                              Audio Out
                              
                              
                                  Constant Voltage Output × 2,100 V COM 
Constant Resistance  Output × 2,30 W 4 Ω to 8 Ω
RCA Out 1:  0 dBV, 100 Ω, unbalance, RCA pin jack
RCA Cascading: support a cascade of up to 3 amplifiers
Bluetooth
                              
                           
                      
                          
                              LED Indicator
                              
                              
                                  Power indicator (solid white): the device is normally working
USB flash drive indicator (solid white): the device is in USB mode
Bluetooth indicator (solid blue): the device is in Bluetooth mode
USB flash drive indicator (off) and Bluetooth indicator (off): the MIC input and RCA input are mixed
                              
                           
                      
                          
                              Volume Knob
                              
                              
                                  MIC Volume Knob × 1,Partition 1 Volume Knob × 1,Partition 2 Volume Knob × 1
                              
                           
                      
                          
                              USB
                              
                              
                                  USB 2.0
File format: FAT32
USB flash drive file playing logic: traverse play level 3 directory files in the USB flash drive.
                              
                           
                      
                          
                              Power Interface
                              
                              
                                  Aperture size: Ø2.0 mm