The Ei650iRF optical smoke alarm is designed for fast and reliable smoke detection, especially for smouldering fires. Its high-performance optical chamber is protected by a sealed mesh to prevent false alarms from dust and insects, and an automatic dust compensation feature offers even more protection. The alarm communicates wirelessly with up to 12 other compatible devices using a pre-installed RadioLINK+ module. It also includes an AudioLINK feature for easy data download and a progressive sound level in test mode for better comfort. The alarm's twist-on mounting base makes it simple to install, and its advanced diagnostics help to pre-warn you of any potential faults.