Features: . 
Output Power 5-100mw 
Wavelength 405nm 
Input Voltage 3-5VDC 
Output Current 30-300mA 
Dimensions 10.5X20mm 

Details: 
405nm 5-100mw constant current driver board, suitable for driving K-pin laser diode. 
The empty pin of the diode guides to the positive lead, so that the module does not require insulation, direct housing is the battery's positive, which makes the laser DIY much easier. 
Input voltage 3-5VDC 
The circuit board gets voltage Boost and then get constant current, so the input current is not the real working current of the laser diode. 
Output current can be adjusted within 30-300mA! 

Package: 
1 x 405nm 5-100mw constant current driver board