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Aico Ei146e Optical Smoke Alarm AC mains power supply and 9V alkaline battery back-up.: Amazon.co.uk: Electronics & Photo
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Yale AC-PSD Sync Alarm Smoke Detector- Sync Smart Home Alarm - 200 m range - Works with Alexa, The Google Assistant - Philips Hue : Amazon.co.uk: DIY & Tools
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Aico Ei146e Optical Smoke Alarm AC mains power supply and 9V alkaline battery back-up.: Amazon.co.uk: Electronics & Photo
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