Excellent little machine. Easy to install and program with Greek instructions. Very good build quality and extremely reliable. I have had it for over 10 years!!!! Without any problems whatsoever. The manufacturer recommends changing the battery (9V flat) annually, but practically it needs to be changed every 2 to 3 years! You can program 8 different programs. But the most important thing is that at any time you can choose the manual mode for as long as you want and then close it. Highly recommended!!