Works very well, read the instructions for troubleshooting
Easy to install and program the timer, and to register the cats' microchips. I had two problems that I managed to solve with the help of the included instructions. 1) The cat couldn't get in. Sometimes yes, sometimes no. It took about 3-4 seconds in the tunnel to scan the cat. My cats don't have that kind of patience. The problem was that "Extra security" was on (EON), and I needed to set it to EOFF. 2) The timer's curfew times didn't work the first day. I had to reprogram them and they've worked ever since.