Cold-rolled steel shell, the surface electrostatic spraying. Structure and materials of the two kinds clock dials: 1.Mirror stainless steel clock circle, tempered glass clock face. 2.No frame structure, organic glass clock face / pc clock face. Using sigle-phase ac£º220 Accuracy of travel time: day difference room temperature). Working environment temperature:0 Working environment relative humidity:10 Installation: wall-mounted (only for one side), double suspenders, bilateral support, or according to customer requirements. Can be added the following functions With back-up dc power supply Timekeeping Adding rs232 serial communication function Built-in 485 repeater / splitter Gps time synchronization Long-wave timing signal synchronization Infrared mobile master clock synchronizes time Rf mobile master clock synchronizes time Infrared clock adjusted device adjusts time Rf clock adjusted device adjusts time Infrared mobile master clock synchronizes time and automatically records the synchronization time. Rf mobile master clock synchronizes time and automatically records the synchronization time. Countdown function. Can be made according to customer requirements