Each unit is fully potted and internally reinforced by DarkLight Dynamics using specialized potting epoxy. This process encapsulates the PCB and components, ensuring they withstand shock and recoil during field use. The unit has been fully sealed, allowing use in wet and rainy environments. As every unit is hand-potted, minor nicks or scratches may be present on the finish. Every unit undergoes a comprehensive functional test both before and after potting to guarantee full reliability and prevent DOA (dead-on-arrival) issues. Potted Sotac Perst-4 is an ideal choice for those looking to enter the world of VIS/IR lasers without breaking the bank. It features a green visible laser (635 nm) and an IR laser (850 nm). Includes a full aluminum KV-D2 remote switch that allows for brightness adjustment and manual on/off functionality. Fully Potted & Weather Proofed Perst-4. Green Visible Laser Wavelength: 635 nm. IR Laser Wavelength: 850 nm.