Smart valve allows control of all radiators in the home from a phone using the app. Home temperatures can be fine-tuned using voice control via Alexa or Google Assistant, and heating schedules can be set based on daily routines to make heating more efficient. Replaces old readiator heads. Requires Kasa Hub KH100 for all smart features. Works with - Amazon Alexa - Google Home - iOS App - Android App 5-29°C Temperature Range Electronic Sensor Fully Programmable Multiple On / Offs Over 7 Days LED Display Smart Hub Required Works with - Amazon Alexa - Google Home - iOS App - Android App 5-29°C Temperature Range Electronic Sensor Fully Programmable Multiple On / Offs Over 7 Days LED Display Smart Hub Required