Package included: 1x PERST -4. Sight + 1x LED Torch. This productis 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. This product is installed on Picatinny rails. The KV-D2 switch (in the kit)can be installed on picatinny rails and 1913 rails. This product contains 2. Green Laser light source: wavelength – 635 nm. IR light source: wavelength – 850 nm. Power supply: CR123A / battery (3 V). Effective range in the dark. Red beam: 300 ± 100 m. IR beam: 400 ± 100 m. The triangular area on the host can switch between visible laser and IR. On the top or side of the host, the round switch is turned on. Turn on through the KV-1P Wire Control Switch. Press the swtich quickly to realize the strobe function. Two small circular buttons on the main unit to adjuest the laser brightness. Fit For: 20mm Picatinny Rail. High-intensity LED is about 500 lumens, illuminates the darkness with dazzling brightness. Can be used when tactical, hunting, etc. Comes with remote pressure switch and tail button cap switch, control momentary and Constant-on modes respectively. Due to various tac. Ical needs, flexibility in the actual battlefield is essential. The rugged Flashlight easily and securely attaches to rails via its integral thumbscrew clamp and is activated by clicking its pushbutton tailcap switch. Battery type:3V CR123A/163. 40(Installation from lamp head). When not in use, please remove the battery to avoid running out of electricity. Due to the ligh. Ting effect, there may be color difference in the pictures taken. The product not.