This remote shutter release adds greater convenience and ease in many shooting situations. Easily plug this remote switch into your camera and turn your camera on The release button reacts fast and fine lock the button for long exposures or continuous shooting. Two-stage release button: Halfway pressing for auto-focus complete pressing for taking pictures. *Press it halfway to activate the auto-focus. *Press it completely to shoot. Slide to lock. Press and slide it to lock the shutter for Bulb Mode photography. Since you can trigger the shutter without touching the camera body it can avoid camera vibration thus resulting in sharper pictures. - Reduce camera shake to produce pictures of super quality - Contains the functions of focusing shutter Buble setting and synchronization - No batteries required - Compatible with Canon RS-60E3/350D/400D/450D/G10/550D/1000D/300D - Includes 90cm cable Chinese/English user manual