SMDV RFN-4 Wireless Remote and Shutter Release Cable for Canon select models Auto-focus by pressing halfway down on the shutter Designed to operate in extreme temperatures ( -20 to +50 C/ -4 to +122F) Exchangeable camera 3 foot long cable for wired or wireless remote control Goes into auto-sleep mode after 2 hours of not shooting Includes a 24 month manufacturer warranty