Feature: 1.TRV thermostat radiator with 5-level modulation and easy to install. If you need to turn off the thermostat, just use the modulation index arrow 0. 2.Suitable for compact radiators with integrated valve blocks. Connection thread: M30 x 1.5. 3.Available in subtle white or stunning fully chrome-plated models with chrome-plated styling sensors that complement the designer radiator and towel rail 4.Ultra-fine production process, you don't have to worry about its service life. specification: Material: Plastic + Alloy Connection thread: M30 x 1.5 Liquid sensor (hydraulic sensor) output: 230V AC; 50 Hz Set point range: 6-28 degrees Celsius Temperature hysteresis: 1.0K Maximum working pressure: 10bar Package Included: 2x radiator thermostatic head