10-year lithium battery (3 V) sealed, service life of at least 10 + 1 years Wireless connection by installing a wireless module (sold separately) i-diagnostics function Failure prediction for battery charge and contamination level i-comfort identification quickly find the detector generating the alarm i-event memory memory function for previous alarm events i-mute function (advanced) manual alarm suppression + 12-hour signal suppression in the event of a fault Pleasant test volume slowly increases in test mode Suitable for bedrooms no flashing LED in operating mode Contamination compensation less susceptible to faults in case of contaminated smoke chamber Self-monitoring automatic self-test with fault display Certified quality VdS, Q certified in accordance with EN 14604, for use in accordance with DIN 14676, extended inspection in accordance with vfdb 14-01 https://elecena.pl/product/18544788/ei650iw-smoke-detector-with-audiolink-function 2021-05-22 https://elecena.pl/product/18544788/ei650iw-smoke-detector-with-audiolink-function 2025-01-31