Zero setting ratio upper limit: 0,*,1,2,3,4,5It has antifreeze protection and adjustment functions, which can provide adjustment assistanceThere is no fixed adjustment range, it is affected by heating temperature and room temperatureBy marking with arrows, you can easily find the desired temperatureApplicable spool size: 15mmNote: 5 levels of modulation, easy to install, if you need to turn off the thermostat, just use the modulation index arrow 0.colour:WhiteMaterial:Copper+ABSsize:85 x 50 x 33mmPackage Contents:3 x M30x1.5 thermostatOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.