Swimming Pool, Spa, Bathtub Wireless indoor / Outdoor Thermometer

Type: Wireless Pool Spa Hot Tub Thermometer Certification: CE Certification: FCC Temperature range in Water: -40'C~60'C (-40'F~140'F) Remote sensor broadcast time: 48 seconds Display Size: 1.9 Inches & Under Wireless Range: 100 meters / 328ft Wireless Frequency: 433 Hz Indoor temperature range: 0 ℃ ~ 50 ℃ / (32°F~122°F) Remote sensor: 2 x AA batteries (not included ) Indoor Unit: 2 x AA batteries (not included ) Product  size: 12 * 7.5 * 2.2cm / 4.72 * 2.96 * 0.87in Feature 1: Indoor unit displays Calendar/ Clock /Alarm Feature 2: Indoor Unit Temp and Humidity  Remote Unit Water Temp Feature 3:  min/max temp from remote sensor