Buy from Amazon : br br SecurityMan AirAlarmII Wireless Smart Home Alarm System Kit with Doorbell (White) br br Easy-to-use and cost-effective DIY Do-It-Yourself wireless intruder alarm system kit br Supports up to 60 wireless sensors 15 wireless defense zones and 4 wireless sensors per zone br Supports up to 5 phone numbers for auto alarm call and 1 management center protocolCID br Armeddisarmed by remote controller phone call or hosts keypad br Programmable password