Except for replicating all functions of a camera's shutter release button it still has the function of Self-Timer Interval Timer Long-Exposure Timer and Exposure Count; Good for time-lapse photography such as flowers blooming and astrophotography; LCD panel can be illuminated; Delay / Self Timer (DELAY): Just like the self timer on your camera. The timer remote switch allows you to set any delay (in 1 second increments) up to 99 hours 99 minutes and 99 second; Interval Timer (INTVL): The Interval Timer can be set to any time period up to 100 hours as well. If you set it to 10 minutes for example one exposure will be taken every 10 minutes until either the film runs out or the Exposure Count limit has been reached; BULB/Long Exposure (LONG): It allows you to take time exposures up to 100 hours long; Exposure Count (N): This setting allows you to set the times of exposures that will be taken up to a total 399 times. For example if you set it to 30 times then the exposure will be only taken 30 times. Size: 40(W) x 20(H) x 143(L)mm.