This is a timer or stopwatch used for studying, etc. I purchased it about 1-2 years ago. I only used it about 2-3 times, so I don't think there are any problems. The batteries will be removed from the main unit and included. I can ship it together with other items I have for sale. I will combine them before you purchase, so please contact me via the comments section. I will not respond to comments from those who have not read my profile.