Optionally radio-networkable with Ei600MRF radio module (available separately). AudioLink function for reading out detector data. Diagnostic function: fault prognosis regarding battery voltage and degree of smoke chamber contamination. Comfort identification for quick location of signal-emitting detectors. Event memory function for past alarm events. Large test/mute button allows operation without a ladder from the floor. Advanced mute function includes manual alarm suppression for 12 hours. Signal suppression occurs at low battery voltage. Suitable for bedrooms with no disturbing LED flashing. Reduced test volume features a slowly increasing alarm volume in test mode. Dirt compensation allows automatic adjustment of sensitivity when the smoke chamber is dirty. False alarm protection is included. Disassembly protection with an optional removal lock protects against unauthorized removal.