B054 4-Channel Microphone Mixer Support Stereo Output With Reverb Treble And Bass Adjustment, USB 5V Power Supply, US Plug Product presentation: 1. 4 microphone input interfaces (6.35mm), can be connected to 1-4 wired microphone 2. 4 channels independent volume adjusting knob, can adjust the volume of 1-4 channels microphone flexibly 3. Reverb adjustment function: Echo knob can adjust the reverberation effect size 4. High and BASS adjustment function:BASS knob to adjust the BASS size of the microphone;The Treble knob adjusts the high pitch of the microphone 5. 2 audio output interfaces: 6.5mm MIC mono output +RCA stereo audio output 6. Standard USB 5V power supply mode, suitable for outdoor mobile power use, wider application range 7. Using compact and thin desktop mini design, compact size, compatible with any device 8. Simple installation: Input and output plug and play easy installation, you can enjoy different audio experience Product Parameter: 1. Input interface: 6.35mm 2. Output interface: 6.35mm+RCA 3. SNR(Signal to Noise Ratio):120dB(A) 4. Distortion: Less or equal to 0.02 5. Frequency response: 20Hz-20kHz 6. Output noise: Less than 0.1mw 7. Output impedance: 100kohm 8. Net weight: 0.48 kg 9. Packed weight: 0.63 kg 10. Product Size: Length 165 mm x width 82 mm x height 38 mm 11. Packaging Size: Length 200mm x width 180mm x height 55mm Kit list: 1. 4-way microphone mixer supports stereo output x 1 2. USB power cord, length 120CM x 1 3. USB power adapter US standard x 1