1.There Are Pc Software And Software Usage Instructions Inside; 2.The Computer Software Debugging Is Downloaded And Saved To The Chip. Then, It Can Be Used Without The Computer. It Can Be Directly Used When The Device Is Turned On Next Time; 3.There Are Various Reverb Sound Effects:Reverb,Echo,Reverb Plate,Auto Tune,Pitch Shifter,Voice Changer,Ping Pong,Auto Wah,Chorus... 4.Various Eq Parameters:Treble, Midrange, Bass Adjustment,Low Pass,High Pass,Band Pass,Band Stop Gain,Noise Gating,Frequency Shifter,Howling Control,AGC,Dynamic Range Compression. 5.If There Is Interference Sound, Please Connect To GND. Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Communication Interface: USB Interface Power Supply Voltage: 12V Power Supply Current: 0.03A Colour:As Shown Material:PCB Package Contents: 1x Mixing Console Audio Reverberation Board Module 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.