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