AX PRO DS-PDSMK-S-WE, bidirectional wireless smoke detector, photoelectric type, for AX PRO panel, built-in buzzer >= 85 dB @ 3m, test and alarm silence button, multicolor signal level/activation light indicator, ambient temperature measurement visible in the app, Tri-X 868MHz wireless communication with AES encryption and range up to 800 m in open space, EN 14604 certification, powered by 1 CR17450 3V battery (installed - non-replaceable) with a lifespan of 10 years, power switch, ceiling mounting base, (diameter x height) 102x35 mm.