QC2.0 charging protocol stipulates that the voltage is fixed at 5V, 9V, 12V, 20V QC3.0 charging protocol stipulates that the voltage can be adjusted in 200mV intervals, and the adjustment range is 3.6V~20V. PD3.0 charging protocol stipulates that the voltage is a fixed value, 5V, 9V, 12V, 15V, 20V. Pressing the left button means voltage increase, pressing the right button means voltage decrease. Press both buttons simultaneously for 3 seconds to switch the charging protocol. Plug in USB Type-A QC2.0 mode: Power on and display C2.0 (indicates QC2.0 mode), then display the voltage to be decoyed 5.0/9.0/12.0/20.0 (4 fixed voltages), then display "----" (indicates voltage measurement in progress), if the charging head supports the voltage, then display the measured decoy voltage If the actual output of the charging head is too large in relation to the desired decoy voltage, "Err" is displayed, followed by the actual voltage measured. After 5 seconds, the voltage display shows "---" (indicating switching current) and then the current output current. Note:Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Colour:Navy blue Material:PCB Size:about 65 x 50 x 33mm Package Contents: 2 x QC2.0 QC3.0 PD3.0 Decoy Module