This product is used to point targets when observing, inspecting and watching small arms shooting at night. This product is a small optical mechanical device that forms laser radiation flux. This product is installed on Picatinny rails. The KV-D2 Tactical switch (in the kit)can be installed on picatinny rails and 1913 rails. This product contains 2 laser functions: Green Laser light source: wavelength – 635 nm IR light source: wavelength – 850 nm Power supply: CR123A / battery (3 V). (Not included) Effective range in the dark: green beam: 300 ± 100 m. IR beam: 400 ± 100 m. Product weight without batteries: no more than 210 g. Overall dimensions: (37? 60? 91) ± 3 mm. The triangular area on the host can switch between visible laser and IR 2. On the top or side of the host, the round switch is turned on. Turn on through the KV-1P Wire Control Switch 3. Two small circular buttons on the main unit to adjuest the laser brightness. Custom Bundle: No Fit For: 20mm Picatinny Rail. 1 or 2 Star DSR Ratings Destroy Our Company. Our working hours Beijing time from 9:00 a. To 18:00 p. USA –Our warehouse in the east United States. Western of the United States———————–3-5days. We are not responsible for any kind of compatible issues, or problems related to any specific software or games. We have a program that automatically replies as soon as you leave your feedback. We care about our valued customers, and will always try to help you. Please give us the opportunity to resolve a problem. We understand the concerns and frustrations you might have, and will try our best to resolve the issues. Thanks in advance for your patience.