Key Features:; High output LED technology ensures optimum light output and low power requirements High efficiency piezo disk and horn profile generate powerful sound output Features Advanced protocol controllable sound output, tone selection, group polling, independent sound or strobe function Automatic synchronization of sounder and strobe Large cable access Rear or surface cable entry Loop continuity spring Simple twist fit onto universal B501AP base (positive “poke yoke” engagement) Anti-tamper feature In-built isolation options Address tag for clear indication Single point of installation – saves time, cost & inventory Low current draw enables more devices on loop Adjustable volume control (on device or from panel) Rotary wheels for clear address indication Clear lens with red flash