With a 30 lap memory the Fastime 29 Stopwatch is an ideal accompaniment for sports days.Water resistant and shock resistant case.Dual repeating and countdown timerPacerAlarm and dateLow battery indicatorMeasures up to 9hrs 59mins 59 secs in 1/100ths of a second.Triple displayBattery includedBatteries are dangerous if swallowed. Keep out of the reach of small ChildrenWhen changing a battery in a Fastime watch ensure that where there is a spring it is in the correct position (under the battery) where there is a clip to hold the battery ensure that the battery is in place under the clip making good contact with the elements. If the watch face still remains blank it may be that the watch needs re-setting this can be done by creating a 'U'-shaped tool from a paperclip and simultaneously touching one end to the back of the battery and the other end to the contact in the reset hole to the left of the battery bar screw.