The WT4911R red Wireless Outdoor Siren is a fully supervised Wireless siren designed to work with the ALEXOR Wireless Panel. The WT4911R combines form and function to provide improved protection against intruders, before they get the chance to enter the home. with its powerful 100dB sounder, the WT4911R will annunciate unwanted entrance to property and premises. The accompanying strobe light also provides a visual warning and deterrent upon activation. The WT4911R distinguishes between burglar and fire alarm by emitting different sounds for each and indicates arm and disarm squawks.