The best user is over 2 hours with 1000 times although most digital alarm clocks contain extra functions such as date and temperature or stopwatch, our customers have said that they never use them and that it the handling and Makes setting the watch more complicated - so we listened to them and removed these functions completely. Extremely Simple To Operate - The clock has been designed with absolute simplicity in mind and you will have no problem whatsover operating it. Easy for children, seniors and the elderly.