AcuRite White Wireless Digital Thermometer: Indoor/outdoor temperature (degrees Fahrenheit or Celsius) Clock (12-hour or 24-hour) Daily high/low temperature Battery-Powered thermometer Tabletop or wall-mountable design Indicator for wireless sensor signal strength Wireless technology transmits data through walls and from a distance Integrated hanger for easy mounting Durable, weather-resistant design Wireless signal LED indicator 3.5" H x 2.3" W x 1.2" D Strong signal penetration (enhanced 433 MHz) Indoor sensors requires 2 AAA batteries (not included) Outdoor wireless sensor requires 2 AA batteries (not inluded)