Kasa Smart Thermostatic Radiator Valve Starter Kit. Precise Temperature Control - Get the right temperature whenever you want it. Schedule & Timer - Make sure it is as hot as you need with presets and schedules that suit your life. Voice Control - Hands-free control that syncs with Amazon Alexa, Google Assistant, or Siri ShortCuts. Frost Protection - Keep your pipes unfrozen and your house safe. Ultra-Long Standby - Works with lot hub, promising longer battery life (over one year). Up to 32 Radiators – Each hub can connect and manage up to 32 radiators. Versatile Compatibility – Fits on most radiator valve body thread (M30x1.5) and the three adapters(RA, RAV & RAVL) included allow more compatibility. Hub Included - Simply replace your old radiator valve with Kasa and get started right away.