UPGRADE YOUR SIMPLISAFE SYSTEM: Compatible with your SimpliSafe Home Security System (3rd Gen). Add up to 100 accessories for customised home protection. This item does not work as a standalone siren - you must already own a SimpliSafe security system. EAR BLASTING DETERRENCE: Protect your home from break-ins with 105dB of ear popping sound from your SimpliSafe auxiliary siren. Customisable between 3 siren volumes to deter intruders SECURE DESIGN: The external siren is IP54 rated & fully weatherproof. It can be used inside or outside. It can be screw mounted into wood, or attached via adhesive strips to plastic fixture EASY TO SETUP: Setup is simple. Place it in the area you think is most accessible and 'add device' with your SimpliSafe Keypad to have peace of mind in no time READY TO USE: Ready to work right out of the box, your auxiliary siren comes pre-installed with batteries and adhesive to have you protected in minutes, Manufacturer: SimpliSafe