Okay well I hate to give this timer a bad review because I really loved the first one I bought. I ordered 3 more of these for my paraproffesionals and 2/3 of the new times of the exact model stopped working after 2 months. I replaced the batteries figuring that was the issue and they still don't work. I am past the 30 day refund timeline so sadly my classroom budget is down 30 bucks. I'm going to look for another brand of timer as they are very important to keeping my classroom running smoothly.