This intervalometer provides photographers with enhanced levels of exposure control. Featuring specialized functionality such as continuous shooting, self-timer, long time exposures, and interval shooting, it allows you to set timer delays, exposure times and intervals up to 99 hours, 59 minutes, 59 seconds in one-second increments. You can also select from 1 to 399 continuous shots or set the device to take an unlimited number of photos. It is great for time lapse series of blooming flowers, sunsets or the night sky. It can also function without batteries as a simple manual remote shutter release. Simply establish the camera's settings and push the remote's shutter button halfway to focus and fully to shoot. In bulb mode, slide the shutter release button up to lock and the shutter will stay open until you release it. Q: I need 50 pictures, the exposure time for each picture is 10s, and the interval time between each picture is 5s, how set? A: (Camera in Bulb mode) Set the "BU" to 10s and "INT" to 15s, then set the "N" to 50 and press the "start" button. Why the "INT" needs to be set 15s instead of 5s as you wanted the interval to be 5s, as in the default programs of this remote, the interval time includes the exposure time. So the 15s of "INT" minus the 10s of "BU" results in 5s real interval time between each picture. It works with Canon cameras with 3-Pin Connection, below are part of the compatible models: EOS R5 EOS 5D Mark IV,III,II,5D,5DS,5DS R EOS 1D,1D Mark II, 1D X Mark III, 1D X Mark II,1Ds,1Ds Mark II,1Ds Mark III,1D C,1D X,1D Mark III,1D Mark II N EOS 7D Mark II,7D,6D Mark II,6D EOS 50D,40D,30D,20D,20Da,10D,D60,D30,EOS 1V,EOS 3,EOS D2000