Whether you are shooting in the studio or outdoors, the Foto&Tech Wired Remote Switch for Pentax provides you with a simple way to control exposures and an easy-to use-tool to create more "keepers" The unit provides functionality such as: autofocusing, continuous shooting or single image capture and long time exposures. Since you can trigger exposures without touching the camera you will capture clear, blur-free images. The unit requires no batteries - it draws its power from the camera. The Wired Remote Switch is a huge asset to keep in your studio or gear bag. This particular wired switch uses a cable that's 110 cm long, and is compatible with PENTAX 17 cameras. Press the button half-way in to autofocus Depress the button fully to trigger the shutter. Press the button and slide it forward to lock for long exposures Larger, more comfortable form factor. Specifications: Total length: 110 cm, Product Weight: 2 ounce.