The Twin Alert combines both a speaker and sounder in a single unit to eliminate the need for two separate products situated in different locations. Audible notifications. The speaker element will mimic keypad tones and the sounds associated with the arming and disarming of a system enabling users to hear confirmation that it has armed correctly upon leaving the property. The volume of the tones can be adjusted to suit individual requirements. Internal Sounder. The internal sounder will only activate on alarm and will override the pre-set speaker volume level to provide a siren output of 100 decibels at 1 metre. This high volume internal siren acts as a deterrent to intruders and will also alert any inhabitants.