Quick and easy installation without any tools - fits with handheld showerheadNo batteries required - The device harvests energy from the water High-precision temperature sensor, a hydro power generator, a thermal sensor, and a digital LED display360rotatable waterproof led screen for better viewingMaterials approved for drinking water. With this device, you can easily monitor the real time water temperature, and take a more enjoyable showerProduct name: LED thermometerProduct weight: 140gSize: 81x80.6x30mmTemperature range: 5-85Measurement error: within 0.5Measurement accuracy: 0.5Material:ABScolour:Photo ColorPackage Contents:1 * Water Shower ThermometerOnly the above package content, other are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.