The AER-04 remote switch has two switch panels that allow easy and fast operation of momentary-on or constant-on illumination. Its high-elastic PU cable with a length of 9 inches applies to most gun barrels. It can go with the ALG-05 QD mount, suitable for a tactical flashlight with a tail diameter of 1.1 inches using 21700 batteries, such as Fenix TK30, TK22 V2.0, TK22 UE, and HT18.