Wicked Lights Intensity Control Coil Cord Tail Cap with Rheostat Control. 

• Features a heavy duty "plug in and screw in style" coiled cord tail cap with coil cord intensity control rheostat
• Includes elastic band with velcro pad for attaching coiled cord switch to weapon
• For use with Wicked Lights Intensity Control models ONLY (will not operate any other model).

WARNING: Make sure you detach the velcro switch from your weapon, and allow the coiled cord to rotate freely (360 degrees) or un-plug the coiled cord from the tail cap, when removing or installing the tailcap. You can twist or break the wires inside the coiled cord if you do not follow this warning.