Hign-concerned Chemical : none Special Feature : Waterproof Included Components : Temperature sensor Display Type : Digital Power Source : Battery Powered Batteries : 4 AAA batteries About this item Automatic Connection: After the battery box of the thermometer and the battery box of the controller are loaded with batteries, the wireless pool thermometer shares data without additional operation. Portable Reader: LCD digital pool thermometer reader makes it easy to read accurate temperature data. Can be held in hand or placed on the platform. Easy Switching Modes: Easily switch °C/°F modes with the press of a button on the controller. There are also functions to adjust the display position of room temperature and water temperature and adjust the time. Excellent Waterproof Design: Built-in IP67 high grade double seal waterproof cover allows the floating pool thermometer to be safely placed in the water. Multi-Scene Use: With its slim size, it can measure water temperature in swimming pools, hot springs, hot baths, small ponds, aquariums and other places. In the big one there is a rope hole to hold it in place. Specifications: Material: ABS Color: White Time Format: 12H/24H (Optional) Temperature Display Unit: ℃ / ℉ (Optional) Host Temperature Test Range: -9.9℃~+50℃ / 14.2℉~122℉ Pool Sensor TemperatureTest Range : -40℃~+70℃ / -40℉~158℉ Temperature Error Range: ±1℃ Powe Supply: Host *2PCS AAABattery( not included), Sensor* 2PCS AAABattery( not included) Transmission Distance : 60 Meters （Open Space） Package Listing: 1* Host 1* Sensor