Enable your Fenix Flashlight to become the perfect accessory for your rail supported mount. The AER-02 features the ability to select momentary on, constant on, and mode/output selection. NEW noiseless (no clicks) design keeps your operation silent when pressing switches to operate the light. Recommend to use this product along with ALG-01 rail mount. The AER-02 fits PD35, PD35TAC, TK09, TK15, TK15C, TK22, and UC35 models only.