Ηow to operate it
There are two switches, one "black" is for the voltage meter to see the battery voltage and the other is the mini switch,
which you choose to use the battery of the device or the DC power <1v to 15v maximum> that you can give from the "right blue terminal"
Τhe Potentiometer is for "increase or decrease" the rotation of the motor.
Τurned to the right is to "increase" turn to the left is to "decrease"
The "left blue terminal" is also an "input power" for the charger module to charge the battery.
You can use any DC power like is a "solar panel" with characteristics of 5 volt /1A.
If the device "does not work", you will need to charge it.
Υou do not have to put out the battery and put them in a wrong "polarity" way.
This will "destroy" the battery charging board! There is no reason to remove the battery.
Τhe battery are have big "capacity", So if the battery are discharged "empty",
you will have to wait for "some time" until it recharges.
First charge over 10 hours. This way the battery will be fully activated
When the "RED led" lights up on charger module means it charges the battery.
When the "BLUE led" lights up on means that the battery is charged.