Macally Air-Alarm Securityman DIY Wireless Home Alarm System Easy-to-use and cost-effective D.I.Y. (do-it-yourself) wireless intruder alarm system kit 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 300/450 feet Supports up to 5 phone numbers for auto alarm call and 1 management center protocol (CID) Armed/disarmed by remote controller, phone call, or hosts keypad