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Sensereo is a smart home safety brand run by Sensereo Limited, a Hong Kong company with a UK customer service email address. It says it was the first company to make Matter over Thread smoke alarms and the first to have one certified as "Works with Apple Home", and it is a member of CoGDEM, the European body for gas detection equipment makers.
The home range covers the MS-1 smoke alarm, the MS-1 Interlink, which comes as a set already linked together, and the MSC-1 combined smoke and carbon monoxide alarm. They connect over Thread to Apple Home, Google Home, Amazon Alexa, SmartThings, Home Assistant and Homey, so alerts reach your phone.
The outdoor site sells Bastion, a portable carbon monoxide detector for tents, campervans, cabins and backpacks. It uses a Figaro TGS-5141 electrochemical sensor with temperature and humidity compensation, adjustable screen brightness and a 1600mAh battery charged by USB-C, rated for more than 500 hours of monitoring. It comes in Matte Black, Earth Brown, Moss Grey and Sandstone Beige. Bastion was on early-bird pre-order and the page said orders ship within 14 days. Orders go through shop.sensereo.com, and Sensereo also sells on Amazon.