The Philio Z-Wave Outdoor Siren (PSE04) is a battery-operated, wireless outdoor siren that produces a loud signal of 100 decibels and features a strobe light to alert you to potential intruders, emergencies, and security incidents. The PSE04 outdoor siren is a simple, small, and elegant Z-Wave siren with six different tones that you can use as a doorbell or burglary alarm. Thanks to the mounting bracket on the back, you can hang the siren anywhere.