Features: Compact and lightweight, ergonomically designed handle is comfortable to grip. No batteries, no wire needed: The color changing LED are powered by running water, no batteries needed. Water temperature sensor: Shower head features color of LED lights changes automatically according to water temperature. (≤31℃: green; 32~43℃: blue; 44-50℃: red). Easy to install: Connects in minutes to any standard overhead shower arm, no extra tools required. Easy to connect, effectively help to save water. Specification: Condition: 100% Brand New Material: ABS Color: Sliver Surface treatment: Electroplating Interface size: G1/2" Installation method: Spiral LED Light Power Supply: Hydroelectric Generation(no extra battery needed) Light Color: Green(≤31℃); Blue(32~43℃); Red(44-50℃) Size: nozzle 75mm / 2.95inch (appr.) Length 250mm / 9.84 inch (appr.) Thickness: 47mm / 1.85 inch (appr.) Packaged included: 1 x Temperature Control Shower Head Notice: Please allow 1-3cm error due to manual measurement and make sure you do not mind before ordering. Please understand that colors may exist chromatic aberration as the different placement of pictures. 1、Compact and lightweight, ergonomically designed handle is comfortable to grip. 2、No batteries, no wire needed: The color changing LED are powered by running water, no batteries needed. 3、Water temperature sensor: Shower head features color of LED lights changes automatically according to water temperature. (≤31℃: green; 32~43℃: blue; 44-50℃: red). 4、Easy to install: Connects in minutes to any standard overhead shower arm, no extra tools required. 5、Easy to connect, effectively help to save water.