Looking for a corded AND battery-operated motion sensor(?) that triggers failover events

[Cobra (Andy - United Kingdom)]

This is what I use

Power Loss Alerts

At our home we often experience voltage fluctuation on our electricity supply with multiple surges. (Not just us – It happens to the whole of the street) The consequence of this is that the RCD on our main fuse board often ‘trips’ knocking all our sockets off (The RCD is unfortunately now a legal requirement in the UK) This tripping is not a problem when we are at home – a quick trip to the garage to reset the RCD doesn’t take long (although resetting all the digital clocks is a pain – I need to replace them with battery backup ones) All my computers, SmartThings, network routers/firewalls etc. are covered by about 6 hours of UPS backup so short term blackouts are not an issue and we often lose power completely for 2-3 hours at a time However; when we are not at home a tripped RCD cou…