I bought these thinking they would last a season and I wouldn't feel bad due to their price. However, these just keep on ticking. I haven't had the issues others have had with squirrels destroying them and the mechanism getting destroyed.
I put them in an area where squirrels and other animals can't get on top of them from nearby trees. Corn is my main use or minerals for deer. I set the timer for a couple times a day for 5-10 seconds at a time. It lasts for months and the batteries last me almost a year. Overall, very happy with the product. Very simple and it just plain works.