The Fenix AER-03 Tactical Remote Pressure Switch. This switch features momentary-on, constant-on and output selection (function may vary with flashlights). The Fenix AER-03 Remote Pressure Switch is dedicated for tactical flashlights. The switch features a noiseless design with attached Velcro, which makes it convenient in your tactical missions or in hunting. Works with the Fenix TK16 and 2015 and 2016 TK32 models.