The TC-80N3 is a remote switch with an 80cm/2.6ft. cord and a self-timer, interval timer, long-exposure timer, and exposure-count setting feature. The timer can be set anywhere from 1 sec. to 99 hrs., 59 min., 59 sec. A dial enables you to easily enter the numeric settings with a single thumb. The LCD panel can also be illuminated. And the rear of the Controller has a hole to keep the EOS-3's remote control socket cap. Compatible Cameras: EOS 10D EOS 20D EOS 20Da EOS 30D EOS 5D EOS D30 EOS D60 EOS-1D EOS-1D Mark II EOS-1D Mark II N EOS-1Ds EOS-1Ds Mark II EOS-1v EOS-1v HS Body EOS-3