A smart radiator valve (SRV)? What, it went to uni? Got a Masters? No, not that kind of smart. It just means you can control the radiators in every room of your home individually through an app on your phone, anytime and anywhere.
Even if you have the oldest sort of radiator valves, the ones you turn manually that have little numbers on them that go from ‘Off’ up to ‘Max’, you can turn up and down the heat without having to crouch down and fiddle about. Just open the app, select the room and decide whether to power up and how hot you want it to be.