Fenix AER-04 remote pressure switch is designed for those flashlights which run with 21700 battery. Its tail adapter is made of A6061-T6 aluminum with type III hard-anodized and anti-abrasive finish. The dual tail switch panel includes a full-silent forward switch and a tape switch; allowing easy and fast operation of momentary-on or constant-on illumination. The innovative full-silent design with attached Velcro makes it very reliable and practical in your tactical missions or hunting.