Protect your home against fire hazards with this Nedis optical smoke detector. The infrared sensor reacts quickly to smoke and immediately triggers a loud 85 dB fire alarm. Thanks to the built-in battery, which, like the sensor, lasts 10 years, you enjoy long-term fire protection without having to change the battery. Its compact size of 60mm x 60mm x 49.2mm ensures the smoke detector blends seamlessly into your interior. You can easily mount the device on the ceiling or wall. This reliable fire alarm helps keep your home safe, day and night.