Apollo XP95 Ancillary Base Sounder is a local-area sounder designed for indoor use with XP95, discovery or Soteria detectors and control panels using the appropriate software. The sounder is made of white flame-retardant polycarbonate with nickel-plated stainless steel contacts. The sounder incorporates a base into which a loop-powered beacon or an XP95 or Discovery detector is fitted. It is powered by the control panel via the loop wiring to which it is connected. The sounder produces an uninterrupted alternating tone of 990Hz for 0.5 seconds and 630Hz for 0.5 seconds. The volume control can be used to adjust the sound stepless from 70 to 85dBA. It should be noted that these sounders do not have a synchronisation feature or pulsed tone. The sounder responds to signals from the associated detectors or beacon and does not have an address of its own. It complies with the essential requirements of the construction products regulation 305/2011/EU.