The Unit i used was a LG 16x DVDRW.. Once the diode is removed. 2 AAA batteries to a double battery holder and then connect the Negative to the Body of the laser diode' and the positive to the first leg on your left. an Aixiz 8mw 650nm laser housing..Rip out the 8mw and put in your new 225mw 650nm laser diode. Fully adjustable Focus Lens 650nm 10mw