X-Sense XC01-M Link+ Pro CO detector, wireless RF linkable (868MHz) to a maximum of 24 X-Sense Link+ Pro wireless detectors. Via the X-Sense SBS50 base station possibility of WiFi network connection via the 2,4 GHz band with up to 50 X-Sense Link+ Pro wireless detectors on 1 base station. Equipped with replaceable CR123A lithium battery with a lifespan of approximately 5 years. Push button for siren mute function (9 minutes). Sound level 85dB at 3 meters.