Oregon Scientific THGR122NX Wireless Remote Sensor Temperature and Humidity

Features

• Digital display shows temperature and humidity
• Sensors can be placed up to 100 feet from main display unit
•  3 channel display 
• Suggest Lithium AAA for very cold conditions 
• Dimensions: 2.75L x .75D x 4H (in.) 
• 2 AAA alkaline batteries included