Pool Sensor Transmitter & Wireless Receiver Pool Sensor Transmitter Monitors water temperature from -40℃ to 60℃, while floating. Temperature units: ℃/℉ Frequency: RF433Mhz Transmission Distance: Up to 300 feet in open space Available Channels: CH1, CH2, CH3 Power Source: 2x AA 1.5V Alkaline Batteries (Not included) Solar power support Wireless Receiver 433MHZ wireless reception for up to 3 channels of water temperature data Records Maximum and Minimum temperatures for both indoor and water readings Temperature alarm settings with snooze feature Calendar range: January 1, 2015 to December 31, 2099, with 12/24 hour format options LED Back Light Display for easy reading Convenient main keys on the receiver panel Power Source: 2x AAA Batteries (Not included) Water Temperature Range: -40℃ to +60℃ Indoor Temperature Range: -10℃ to +50℃ Note Please read the user manual carefully before use. Batteries are not included. Package Includes 1 x Pool Sensor Transmitter 1 x Wireless Receiver 1 x User Manual