The receiver is on and connected to wifi. The immersion heater is off. Pushing the button with the broken-circle symbol will toggle the immersion on / off until the next programmed transition time arrives.
FSTWIFITU. Wi-Fi enabled control for all manner of electrical applications, now improved with Google Home and Amazon Alexa Support. <br /> <br /> Programme settings...
www.timeguard.com
Unnecessarily complicated IMHO but I'm a dinosaur who believes that heating systems have no business needing wifi / internet connections / smartphones to work.
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Reply to the thread, titled "Smart immersion heater switch" which is posted in Central Heating Forum on Plumbers Forums.