No more need for batteries with these time saving and money saving stopwatches! Simply store your stopwatches in the docking station included and plug in when a recharge is needed. You can make the stopwatch age and stage appropriate by setting them to show minutes/seconds, minutes/seconds/tenths or minutes/seconds/tenths/hundredths. The on/off button is contained at the top so that children cannot easily reset the watches. The stopwatches have an auto sleep mode after 5 minutes of inactivity. Brightly coloured to ensure easy classroom management, the set comprises 12 rechargeable stopwatches, safe lanyards and a rechargeable/docking station. Will power for 10 hours without needing a recharge, due to power saving mode.