This thermometer can floats on the water and tests the temperature of the water so you know exactly what temperature the water is and prevents burns or frostbite. Name:Pool Thermometer: Color: red+white Measuring range: -40 to 60 Frequency: RF433Mhz Transmission distance: 300 feet in open space Channel for option: CH1, CH2, CH3 Battery: 2 * AA Battery(Not included) Wireless Receiver: Color: black Frequency: 433Mhz Battery: 2 * AA Battery(Not included) Water temperature measuring range: -40 to +60 Indoor temperature measuring range: -10 to +50 Package size: 200 * 100 * 80mm / 7.9 * 3.9 * 3.1in Package weight: 345g / 12.2ounce Specifications: Features: Can receive three channels with 433MHz, and receive water temperature from up to 3 locations, practical and professional. You can set temperature alarm, alarm with snooze, display indoor and water temperature, month, date, week, time and reception channel, powerful and reliable. Clear LCD display, easy to see the data. Main keys on the receiver panel for convenient use. Suitable for measuring temperature in swimming pool, pond and spa. Package Included: 1 * Pool Thermometer 1 * Wireless Receiver 1 * User Manual Notes: Transition: 1cm=10mm=0.39inch Please allow 1-3mm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!