Thisshower thermometer is very suitable for families with babies, toddlers or elderly people, ensuring that your loved ones will not be exposed to too hot or too cold water.Built-in electricity generator, self generating power-supply, no need for batterys. Features: With this digital shower thermometer,no need to worry about the water being too hot or too cold before stepping into the water. Built-in electricity generator, self generating power-supply, no need for batteries. High-precision temperature sensor, accurately measures the temperature of water ranging from 5C-85C with an error of 0.5C. Easy to install and remove. No tools are required, 1/2 inch nut, compatible with most of the shower equipment. 3 color indicator light, the screen also displays the indicator light (blue/ green/ red) to help you choose the suitable water temperature. Suitable for families with babies, toddlers or elderly people, ensuring that your loved ones will not be exposed to too hot or too cold water. Specifications: Material: ABS (Electroplating) + PC Screw Nut: 1/2in Temperature Display: C/ Temperature Range: 5~85C (41~185) Measurement Accuracy: 0.5C Indicator Light: Blue ( 38 or 100); Green (38-42 or 80-108); Red (42 or 108) Timing Range: 99 hours and 59 minutes Package Size: 120*105*35mm/4.7*4.1*1.4in Package Weight: 120g/4.2oz Packing List: 1*Shower Thermometer 1*Waterproof Gasket 1*User Manual