Keep your home or business safe and secure with this reliable, cutting-edge wireless security system. The QSDL503AD Wireless Security Alarm System utilizes innovative technology with trouble-free wireless connections to provide security, making it a great choice for protecting against intruders. When the alarm is triggered the system can call up to 6 phone numbers that you program into it. With this do-it-yourself system, gone are the days of costly monthly monitoring fees.