Product information:Material: PC+ABSStyle: simple and modernSize: 30*5*3 [cm]Color classification: black shell warm white light WIFI versionVoltage: DC 5VCurrent: less than 500MAPower consumption: less than 2.5WWorking temperature: 0-55 degrees CelsiusWorking humidity: less than 95 (no condensation)Wireless network: 2.4GHz 802.11 b/g/nBackup battery: CR1220Size: 30*5*3 cm (length, height and thickness)Features:Function:LED display, brightness adjustable;.NTP time synchronization, after ultra-high-precision networking, the error is less than 1 second;High-precision clock module, the annual error is plus or minus 1 minute when there is no network;Built-in CR1220 battery, it can supply power to the time chip when the power is cut, so that the time is right when the power is turned on;Webpage controls the clock, what you see is what you get;The display content has time\date\temperature\week, which can be displayed individually or in combination;Brightness adjustment has fixed\timed brightness\timed switch;Time server time zone setting, which can be used in different countries and regions;System functions are initialized and restored to factory settings.Note: This clock can be used normally without networking.Packing list:Luminous electronic clock with perpetual calendar*1