Manufactured in 2022. Protect your home with the HiSPEC HSSAHEFF10 mains heat alarm. This reliable and high-quality alarm has a lithium battery backup and a rechargeable battery for added security. With smart home compatibility with Amazon Alexa and Bluetooth protocol, you can easily monitor your home's safety from anywhere. The sleek white design of this mains heat alarm fits seamlessly into any home decor. It has an operating sound rating of 85dB and is equipped with a single battery. This HiSPEC model has a diameter, depth, and width of 0.5cm, making it a discreet addition to your home security system. Manufactured in 2022, this mains heat alarm is a reliable and effective way to protect your home.