Wireless Trigger Release & Shutter Release Button Cable for Canon EOS 1D / 5D / 50D / 40D/ 30D / 20D / 10D Digital Cameras Use FSK 433MHz signal Transmission distance is up to 300 meters You may choose single shot, continunous shooting or delay shooting Easy to operate Compatible with Canon 1D/1DS, EOS5D/50D/40D/30D/20D/10D