Product Description Wireless Connection: Indoor and outdoor temperature display C/F optional, compatible with 2x1.5V AAA alkaline batteries(NOT INCLUDED). The temperature detection range of the indoor host is -9.9C~+50C (14.2F~122F), and the temperature detection range of the pool sensor is -40C~+70C (-40F~158F). Wireless rang Temperature error within 1C, transmission distance 60 meters. Easy to Use: Put Floating pool thermometer probe on the water surface, built-in a sensitive contact type probe, making it detects water temperature quickly and accurately. it will automatically transmit data to the host. real-time temperature of the water 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 the water temperature both indoors and outdoors. Multiple Uses: Time display optional 12/24H, With daily clock function, it is clear at a glance. Ponds water temperature tester is ideal for indoor & outdoor use such as swimming pools, hot tubs, fish ponds, aquariums, baby bath, spas and all other types of places, monitoring temperature in outdoor hot tubs from inside the house. Package Included: 1 x Host 1 x Pool Temperature Outdoor Unit Note: 1. Due to the different monitor and lighting effect, the actual color of the item may be slightly different from the color shown on the pictures. 2. Please allow 1-3cm error due to manual measurement. (1 inch = 2.54 cm) Thanks for your support :)