M961 Tactical Light for 22 mm RIS rail it's maximum output is 188 lm and uses UM or XM swich assembly:
1) Partlally depress Tallcap pushbutton or apply pressure to tape switch for momentary light.
2) Fully depress Tallcap pushbutton to the "click-on" position for constant light.
3) When tape switch cable is unplugged, use plug socket cover to keep out dust or water.
Power of two CR123 Lithium batteries (NOT INCLUDED) allows 45 minutes of runtime.