The Fenix AER-04 tactical remote switch is the perfect accessory for your rail mounted flashlight. This remote switch allow you quickly select momentary on of the brightest level with the pressure pad or constant on with the tactical switch. Easily attach your remote switch either by cable ties or the hook and loop backer (both included). IP68 rated dustproof and waterproof underwater to 2 meters. This remote switch only works with the following current Fenix Flashlight Models: HT18, HT30R, PD36R PRO, PD36 TAC, TK16 V2.0, TK20R V2.0, TK20R UE, TK22 TAC, TK22 UE, and TK30 only. Not compatible with the PD36R.