Features:– Outdoor Range: -30 to 60 C (-22 to 140 F) (Lithium Battery)- Indoor Range -20 to 60 C (-4 to 140 F) (Alkaline batteries)- Humidity Range: 5% to 95% – Range: 30 Meters (100 Feet) w/ No Obstructions. (Transmission every 40 seconds) + 3 Channel settings- For Indoor or Outdoor use (Water resistant Case) Wall Mountable- Requires 2 AAA Batteries (not included)- Temperature: yes / Humidity: yes / Air pressure: No / RF Signal: No / Protocol: 2.1 / Channels: 3- Dimensions 7 x 3 x 8 inches