I swear, this is the hardest, most difficult thing to get used to.
So, if you have it set up with EOS-Utility, which seems to be the most simple way to synch the computer and the camera, all seems okay.
Then, when you walk away from your wifi zone, or shut the computer off, you have to manually shut off the camera's WIFI, or it blinks red, eating batteries -- ANNOYING.
Then, the next time you want to wifi, you have to go through the connection menus to establish wifi again, making you wonder WHY THE HECK you ever wanted to use the wifi, and didn't instead just rip the card out and put it in to a card reader.
In short, there's no plug-n-play AT ALL with this device, nor is there any auto detection of anything -- sort of like the GPS card, which if it can't find GPS, just blinks forever (say, you're indoors), eating battery, instead of just cycling off.
Maybe I'm using these devices wrong, but they're really not "professional" level, or even "current" level with today's technology or useability standards -- they're just plain annoying instead, making you not want to use them in the future.
also, the manual for the wifi adaptor jumps around, making 4 of the 5 connection methods virtually impossible to follow -- again, why macs gained so much, and PCs failed so much -- nobody wants to become a pseudo-expert in internet connectivity to make the pro equipment to work properly -- that should be automatic in the included software -- instead, they just want the stuff to work.