Time setting The professional LEDI ® clocks can display the same time information, synchronized by a master clock or a time server. On standalone and pulse version, the time setting is manual. Display date and time alternately. Internal time base The LEDI ® clock has its own temperature compensated TCXO time base which allows an accuracy about 0.1 sec / day between 0° to 40°C in case of synchronization loss. Security Backup of time information in case of mains absence, by lithium battery : 10 years. Key features Perfectly silent, direct and accurate reading of time. SMD bi-colour LED technology allows to change the display colour in red, green or yellow (optional white or blue). The patented technology of the light guide provides a perfect regularity of the brightness and viewing angle at 160 °. A protection against over-voltage and industrial interference via EMC filter. An easy "plug and play" installation. An anodized aluminium case wall mount (screw lock) or bracket mount. Securit glass 4mm on front side. Its participation in the sustainable development life span over 20 years. 2 years warranty.