We offer a wide range of large LED clocks for buildings, railway stations, halls and sports halls. All devices of the Z and ZT series are resistant to adverse weather conditions. We recommend additional equipment: satellite time synchronisation GPS - each clock shows the same time. The GPS time synchronisation has many advantages over the DCF time synchronisation: it is cheaper, the reception range covers all the country, it does not require the adjustment of the aerial, and it is resistant to interferences. The resistance to interferences is particularly important in industry and close to mobile network transmitters. The GPS time synchronisation on clocks well replaces clock networks in large buildings. The synchronisation provides unassisted transition from daylight-saving time to standard time and vice versa.