All integral time clocks in school signs can be programmed in advance for a few years ahead. School holidays disable the sign; school times during periods when children are arriving/leaving school grounds enable the sign.
Full LED school signs can also be used as vehicle activated signs. For example during school times over speed vehicles set off the school children image; then during out of school times the sign can operate as a speed reminder sign to drivers.
Bluetooth and web access options enable changing the times/adding holiday periods to the time clock to be done without the need of connecting any cables to the sign.