Specifications:1) Indoor temperature range: -20°C ~ +60°C2) Remote temperature range: -40°C ~ +65°C3) Temperature accuracy: +/-1.0°C4) Quartz time accracy: +/-1.0s per day5) Power requirements (receiver): 2 x "AAA" alkaline batteries (not included)6) Power requirement (remote): 2 x "AAA" alkaline batteries (not included)7) Transmission frequency: 433.92MHz 8) Transmission range: up to 50 meters (150 feet) in free open air9) Minimum 18 months battery life for outdoor sensor(alkaline battery used)10) Minimum one year battery life for indoor receiver(alkaline battery used)11)Alarm Sound level: 60~65db with 20cm distance from back 

1) Indoor temperature (°F or °C) 2) Remote temperature (°F or °C)3) One XT100 included4) Receive one remote sensor 5) Calendar date display6) Min. and max. memory7) Quartz time,date 8)12 or 24 hour time mode 9) Synchronized instant reception10) Crescendo Alarm 11) Four Colors Available: white,yellow, red and blue11) Flip out desk stand or wall mount12) size 75x60x20(RX),65x48x28(TX)