The SecurityMan AirAlarmII D.I.Y. Wireless Home Alarm System Kit is a wireless LED touchpad security alarm system kit with doorbell for use in a home or business. It is user-friendly and easy to use, protecting your home/business at a minimum cost. The system will send an alert by phone calls through a series of enlisted phone numbers. You can then dial into the host to arm or disarm using the phone's numeric keypad. The Air-AlarmII system can be upgraded by adding up to 60 wireless sensors, sirens, and up to 10 remote controllers. FEATURES: Supports up to 60 wireless sensors (15 wireless defense zones and 4 wireless sensors per zone). Transmit at 430-433MHz frequency band, wireless transmitting distance up to 300 feet (doorbell, remote controller, siren) and up to 450 feet (magnetic smart door/window sensor and PIR motion sensor). Supports up to 5 phone numbers for auto alarm call and 1 management center protocol(CID). Easy "one-key" armed/disarmed operation. Programmable silent alarm or audible alarm. Recordable alarm voice message (up to 10 seconds record time). Telephone line disconnection alarm sounds every 5 seconds. Smart 3 defense lines configuration-1st defense line is the perimeter, 2nd defense line for in-room, and 24-hour defense line). Internal rechargeable Li-ion backup battery in alarm host lasts up to 16 hours. Rechargeable doorbell battery lasts up to 3 years. Smart alert and zone notification when attempting to arm the host with an open door or window. Host chirps if door/window sensor is open/close in disarm mode. Programmable password. Compatible with Ademco CID protocol. CONTENTS: Air-Alarm II host with LED touch keypad, Host Anchor Card, 12VDC Power Adapter, Wireless Doorbell Button, Wireless Wide-Angle PIR Motion Sensor, Wireless Magnetic Door/Window Sensor (with mount), Wireless Indoor Siren, 2 Wireless Remote Controllers, Phone Cable, Warning Sign, Accessories.