I like the product overall - it works well. A bit too well though, the lids pops up every time you walk by it. It needs 4 AA batteries - the instructions indicate that they will need replacing between 2 & 4 times a year based on 20 openings a day. If the bin is up against a wall there is a good chance the "off switch" may get pressed by accident. [This review was collected as part of a promotion.]