I thought it was a good idea to buy one of these since they're almost the same price as the step cans. What a mistake! These open a close as you walk by, so this causes a whiff if you have food that's rotting in the can. They also stop working after about 6 months. I've bought the same can at Costco 3x and returned it 3x. I ended up buying a step can from bed, bath and beyond and am loving it. No need for batteries and no whiff every time I walk by.