FireAngel Wi-Safe2 Interlinked Wireless Thermistek heat alarm head, FP1720W2 with 5+ year life battery | Connevans
FireAngel Pro Connected Smart Smoke Alarm, Battery Powered with Wireless Interlink and 10 Year Life, FP2620W2-R : Amazon.co.uk: DIY & Tools
FireAngel Pro Connected Smart Smoke Alarm, Mains Powered with Wireless Interlink and 10 Year Life Back-Up Battery, FP1640W2-R , White : Amazon.co.uk: DIY & Tools