This is a Surefire Remote Switch, model DS-SR07.
The DS-SR07 is a waterproof switch assembly for SureFire's Scoutlight Weapon Lights. Includes system disable feature" click on/off pushbutton switch" and a plug-in SR07 switch assembly with a 7" momentary-on and click on/off remote tape switch. The integrated pushbutton and remote switch assembly operate independently" providing switch redundancy. FITS: Scoutlight Weapon Lights
Features:
Click on/off pushbutton switch
Plug-in SR07 7 remote switch System disable feature;Two piece, O-ring sealed housing
