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 °. The front face of the LEDI ® is coated with an antiglare and antiscratch film giving an extraordinary 60000 : 1 level of contrast. A protection against over-voltage and industrial interference via EMC filter. An easy "plug and play" installation. Anodized aluminium case : Single face IP54 waterproof. Double face IP30 or IP54 waterproof. Its participation in the sustainable development life span over 20 years. 2 years warranty.