Oregon Scientific John Deere Branded Wather Thermo Sensor

Features: For the pool, hot tub, boat, lake, or anywhere guests want to know the temperature of the water. Waterproof floating sensor displays and transmits water temperature. 3 channel selectable. 2.1 Protocol. Specifications: RF transmission range: 328 feet. RF transmission frequency: 433MHz. Temperature resolution: 0.2 degrees F (0.1 C). Operating range in water: 32 degrees F (0 C) to 122 degrees F (50 C). Operation in room temperature: -22 degrees F (-30 C) to 185 degrees F (85 C). Data transfer: Approximately every 40 seconds. Remote sensor: Waterproof up to 3.28 feet. Batteries: 2 x UM-3 / AA 1.5V. Number of channels: 3.