Just bought one of these for an eos 300D. This remote control is tiny! it has a bracket that fits it to the camera strap so you need never forget it.
The remote will take an immediate shot, a 2 second delayed shot, or work the bulb setting (one click open one click to shut). This remote will NOT as far as I know - operate the multiple shooting (burst) mode or give you the half pressed exposure button info on an eos 300D.
But I love this gadget its soooo small, its actual size fitted to the strap bracket is; 16mm D x 60mm L x 23mm W, in use the unit is only 10mm Deep, and uses 2x CR1220 watch type batteries