This is an open source Constant current LED driver. It is ideal for 12V 150mA LED's in default configuration but can drive LED's with forward voltage drops up to 24V.
It has an on board trimmer that can adjust the LED intensity from 0 to 100% but an external potentiometer can be added instead the integrated one.
As a power source it uses lithium 18650 battery cell or an external 3-5 volts DC power source.
Battery can be charged via the charging port at 5V.
It is ideal for DIY projects.
The buyer needs to add a suitable LED and battery separately.
Dimensions of the boar are 97.5mm x 43mm and the height is 25mm.
For more information download the SCHEMATIC and BOM here.