Wireless Pool Thermometer and Receiver Kit, Floating Thermometer with Easy-to-Read Display, Swimming Pool, Hot Tub, Spa Thermometer Welcome to our store Features: Wireless Connection: Indoor and Outdoor Temperature Display C/F Optional Compatible with 2x1 . 5V AAA alkaline battery (not included). The temperature sensing range of the indoor host is -9.9C~+50C (14.2F~122F), and the temperature sensing range of the swimming pool sensor is -40C~+70C (-40F~158F). The wireless temperature measurement error is within 1C, and the transmission distance is 60 meters. Easy to use: Place the floating pool thermometer probe on the water surface, and the built-in sensitive contact probe enables it to detect the water temperature quickly and accurately. It automatically sends data to the host. The real-time temperature of the water body where the sensor is located and the real-time temperature of the room where the host is located can be displayed on the same screen. You can read indoor and outdoor water temperature. Multiple applications: The time display can be 12/24H, and it has a daily clock function, which is clear at a glance. The pond water temperature tester is ideal for indoor and outdoor use such as swimming pools, hot tubs, fish ponds, aquariums, baby pools, spas and all other types of establishments to monitor the temperature of an outdoor hot tub at home. Package Included: 1 x Main Unit 1 x Pool Temperature Outdoor Unit Note: 1. Due to different monitors and light effects, the actual color of the item may be slightly different from the color shown on the picture. 2. Due to manual measurement, please allow 1-3cm error. (1 inch = 2.54 cm) Thanks for your support