Note:
1. By default, Data+ and Data- are short-circuited on this module, which is suitable for charging most devices. If it is necessary to add an identification resistor, cut the conductor strip between D+ and D-.

Instructions:
1. After switching on, the voltmeter displays the input voltage.
2. To enable or disable the 5V USB output, press the "Output Enable" button next to IN-. The USB power indicator LED will light up.
3. If you want to turn the digital display on or off, press the "Low Power" button next to IN+.
The module remembers the settings, so if you have turned off the display or the output, they will be turned off even after restarting.


Calibration:
1. In normal operation, long press the "Output Enable" button for 2 seconds, then release it, the voltage meter will flash.
2. With the "Output enable" button, the displayed voltage can be increased by one unit, with the "Low Power" button it can be decreased. (one unit = 0.1V)
3. After setting the voltage, press and hold the "Output Enable" button for 2 seconds, then release it.
When switched off, the parameter settings are automatically saved.