Specification:  Pool Sensor Transmitter:  1. -40℃~60℃ water temperature monitoring while floating in the water.  2. Temperature unit: ℃/℉.  3. Frequency:RF433Mhz.  4. Transmission Distance: 300 feet in open space.  5. Channel for option: CH1, CH2, CH3.  6. Power: 2xAA 1.5V Alkaline Battery(Not included).  7. Supports solar power.  Wireless Receiver:  1. 433MHZ wireless receives 3 channel's water temperature.  2. Max/Min record of indoor and water temperature.  3. Supports setting temperature alarm. Alarm with snooze function.  4. Calander from Jan 1, 2015 to Dec 31, 2099. Adjustable 12/24 hour format.  5. Display with LED Back Light.  6. Main keys on the receiver panel for convenient use.  7. Power: 2xAAA Battery(Not included).  8. Water temperature: -40℃~+60℃.  9. Indoor temperature: -10℃~+50℃.     Note:  1. Please read the user manual carefully before using.  2. Battery is not included      Package Include:  1 x Pool Sensor Transmitter.  1 x Wireless Receiver.  1 x User Manual