Built-in temperature sensing , using the principle of temperature sensing , self-adjusting the proportion of hot and cold water into the water for temperature control.Free Head and Grub Screw.The cart measures approx 94mm long.Specifications:Item type: ThermostaticMaterial: copper.Color: As pictures.Types: faucet accessory.Package includes:1* ThermostaticNotes:Transition: 1cm=10mm=0.39inch1. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures. Thank you!2. Please allow 1-3cm measuring deviation due to manual measurement.