I watched the video and followed the instructions and it was still a real challenge getting the battery installed correctly, but once it was in there and working, this is a HUGE improvement over the OEM KeyFob. It doesn't LOOK like it would be much smaller, but in the hand it definitely feels more compact and I love that the actual 'key' isn't flipping out randomly all the time now, but is safely stored in the back of the device. HIGHLY recommended upgrade!