PLEASE BE ADVISED THAT THIS MODEL NEEDS TO BE PRE-ORDERED AND HAS AN ORDER LEAD-TIME OF APPROXIMATELY 2-4 WORKING DAYS. Two stage shutter button, half press for auto focus, full press for shutter release (take photo) Functions include: Shutter-release lock Long-release timer (for Bulb exposure) Compatible Products: Digital Rebel XSi Digital Rebel XTi EOS Digital Rebel EOS Digital Rebel XT EOS ELAN 7 / 7E EOS ELAN 7N EOS ELAN II EOS ELAN IIE EOS IX LITE EOS Rebel 2000 EOS Rebel G EOS Rebel G II EOS Rebel T2 EOS Rebel TI EOS Rebel X EOS Rebel XS