MCS-740 two-way, self-powered fully wireless outdoor siren (IP55) provides the perfect security solution for home owners looking for an external siren that is both affordable and easy to install. Sleek design and high power strobe light (choice of red, blue). Large free screen-print area available for company logo and information. Easy, cabling-free installation. Fully wireless – battery-operated with no power supply required. Two-way fully supervised communication with the control panel. Two diversity antennas for highly reliable wireless performance. Audible and visual notifications of intrusions, fires, low battery voltage, communication disruptions, arming and disarming. Differentiated alarm sounds for intrusion and fire. Loud 110dB Piezo siren. Double tamper protection (wall and cover). Robust design and weatherproof housing (IP55).