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Functions:
* time and calendar function 
* alarm and snooze function  
* indoor temperature, range: 0℃-50℃, tolerance +/1℃
* indoor humidity, range:25%~95%, tolerance +/-5% from range 35% to 85%, otherwise +/-7% 
* simulant weather forcecast display  
* Max/Min record of temperature and humidity
* sound controlled function for display when powered by batteries
* brightness adjustment