Using the Fenix remote pressure switch AER - 02 is easy. First, make sure your tactical flashlight (like PD35, TK09, or TK22) has a tail diameter of 25.4mm. Connect the switch to the flashlight using the 23 - centimeter cable. You can then use the switch to control the flashlight without making any noise. When using it, avoid pulling the cable too hard to prevent damage. To maintain it, keep it dry and clean. If it gets dirty, you can use a soft, dry cloth to wipe it. Don't expose it to extreme temperatures or moisture for a long time, as this may affect its performance.