Frog Thermometer, Indoor or Outdoor, This Window Thermometer has four suction-cupped feet so it can adhere to exterior of your window. This thermometer is made of durable plastic to withstand the elements. Four (4) suction cups for window application Displays temperature in Celsius and Fahrenheit. Clean surface before use, and moisten the suction cups to allow them to hold better.Frog with outside thermometer. Shows temperatures between: -30 to 50 ºC / -21 to 120 ºF. comes bubble bagged for safety