* Display Indoor temperaturer and humidity, Outdoor temperature;
* Record the maximum and minimum temperature and humidity;
* Deg C and deg F switch;                              
* Freeze from -1C to +4C;
* Temperature measure range:
                     Indoor: -10~+50C(+14~+122F)
                     Outdoor: -50~+70C(-58~+158F)
* Humidity measure range: 20~99% RH;      
* Accuracy: +/-1C, +/-5% RH;    
* Time and alarm                  
* 1.5V operate ( AAA );    

* Use of the environment: -10~+50C