Green Laser light source: wavelength – 635 nm IR light source: wavelength – 850 nm Power supply: CR123A (Not included) / battery (3 V). Effective range in the dark: red 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. Press the swtich quickly to realize the momentary function. Two small circular buttons on the main unit to adjuest the laser brightness. Fit For: 20mm Picatinny Rail Material: Metal. New Pointer PERST-4 IR / Green Laser Sight w/ KV-D2 Switch Reset. PERST-4 IR Green Laser Sight. Perst-4 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. (in the kit)can be installed on picatinny rails and 1913 rails. Perst-4 contains 2 laser functions. Green Laser light source: wavelength – 635 nm. IR light source: wavelength – 850 nm. Power supply: CR123A (Not included) / battery (3 V). Effective range in the dark. Red beam: 300 ± 100 m. The triangular area on the host can switch between visible laser and IR. Turn on through the KV-1P Wire Control Switch. Fit For: 20mm Picatinny Rail. If you do not receive your item on time, please firstly go to your local post office to check if the package is left there. It happens sometimes when the receiver is not at home. Return without notice is not acceptable. If items defect after 30 days, you can still send it back to us. We wil do our best to deal with all issues you asked. IR Laser, Green Laser.