As time elapses the red disk disappears. Large enough to see from a distance. You never need to replace batteries. (Make sure to wind-up the timer every time before setting countdown minutes) Measures 7.5x7.5 inches / 190x190mm. No batteries...
QSP Service Clock / Chrono Suitable for display of Time of Day or as Chrono Countdown Numbers are 10cm High Clock will count up or down Interval Timer with alarm 12/24h 220v Power Supply or Via Battery (Not Included) European Type Plug