SR-740 PG2 is two-way wireless outdoor sirens (IP55). They provides the perfect security solution for home owners with a PowerMaster system who are looking for an affordable and easy to install outdoor siren. It excels in offering cabling-free installation and optional extended time between battery changes. Prolonged battery life (8 years with typical use). Loud 110db piezo siren. Differentiated alarm sounds for intrusion, fire, gas and flood. Large print screen area for customizable logos. Dimensions: 295 x 186 x 63mm (11.63 x 7.31 x 2.5in).