I don't normally rate very low but this device only lasted a few months before it stopped working for no apparent reason. It was placed on a clean window that gets plenty of sunlight throughout the day and it worked fine until today. The gears don't move at all when under direct sunlight and I tested this by bringing it outside on a sunny day to make sure. The device was great when it worked but I expected it to last at least a year or so....I am very disappointed.