Features:
Monitors Indoor Temperature (°F or °C)
Wireless Outdoor Temperature (°F or °C)
Wireless Outdoor Humidity
MIN/MAX Temperature & Humidity Records
12/24 Hour Digital Time Display
Wall Hanging or Free Standing
Sensor Reception Icon
 
Specifications:

Outdoor Relative Humidity: 1% to 99%
Outdoor Relative Temperature Range: -39.8°F to 139.8°F
Indoor Temperature Range: 14.1°F to 139.8°F
Wireless Transmission Range: up to 330 Feet
Can Receive up to 3 Sensors

Power Requirements
Receiver: 2 "AA" Alkaline Batteries (not included)
Sensor: 2 "AA" Alkaline Batteries (not included)
Battery Life: up to 24 Months