SABRE Indoor Home Alarm Siren for WP-100 Wireless Home Security Burglar Alarm System - DIY EASY to Install ATTENTION-GRABBING  this Indoor Siren with 100 dB alarm helps wake/alert homeowner or renter; adds sound to additional areas in your home which may be unreachable by the main control panel (audible up to 300 feet/100M away) MAXIMUM SECURITY  fortify your existing Wireless Home Alarm System with this additional siren that sounds when signaled by the system; sensors can be placed up to 500 feet/150M from main control panel ATTRACTIVE & CONSUMER PREFERRED  superior to other home security products, this premium white alarm looks great inside your home EASY INSTALLATION  no wiring needed; includes a 240V AC adaptor with backup battery option (requires 3xAAA batteries, not included) EXTRA LEVEL OF SECURITY  provides battery status update with low battery indicator