1.Lumen:1000 lm

2.Function: White light constant on 

3.Battery:16340*1/CR123A*1/18350*1

4.Suitable for pistol and 20mm rail

5.The lumen is not constant, it will gradually dim with the power on time, and it will be constant after 5 minutes of power on 

6.Material:aluminum alloy

7.Three options of cover caps of the button

8.The working time will be different when use different kinds of batteries.