Features:
1) Indoor temperature (°C or °F) 
2) Remote temperature (°C or °F)
3) Remote humidity  
4) One WH2 included
5) Can receive as many as three remotes 
6) Free standing
7) Min. and max. memory
8) Manual set time 
9) 12 or 24 hour time mode 
10) Synchronized instant reception
11) Low power consumption( over 2 years battery life for both base station and 
     remote sensor)

Specifications:
1) Humidity range:  20% - 95% (+/-5% under 0 to 45°C)
2) Remote temperature range: -40 ~ +65°C
3) Indoor temperature range: 0 ~ +60°C
4)  Temperature accuracy: +/-1.0°C

Power requirements 

Base station: 2 x "AA" alkaline batteries (not included)
Sensor : 2 x "AAA" alkaline batteries (not included)

 Transmission frequency: 433MHz 
 Transmission range: up to 300 feet open air