. 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~+50C(+14~+122F)
                     Outdoor: -50~+70C(-58~+158F)
. Humidity measure range: 20~99% RH;      
. Accuracy: +/-1C,+/-5% RH;
. 1.5V operate ( AAA );                    
. Use of the environment: -10~+50C