I purchased these SystemPro wireless remotes to test for my equipment blog. They were used indoors, once, long enough to assess their efficacy and value, and then repackaged as new. Both come with appropriate batteries. Both for CANON DSLRs. 1- SystemPro #3945 2 in 1 Remote Shutter Release - $20 (or trade for a new Canon 1D MKIV ) Shipping included. This is a wired remote but can be used in conjunction with a wireless receiver purchased separately. The cable is 30" and is compatible with all Canon DSLR shutter release functions. Retails at around $30. 1- SystemPro#1810 Wireless Remote Shutter Release - $75 (or trade for a Canon 70-200mm f2.8L IS USM) Shipping included. Wireless remote, receiver mounts on hot shoe receptacle. 320' working distance. Compatible with all Canon DSLR shutter release functions. Retails at around $90.