Macally Air-AlarmI D.I.Y. Wireless Home Alarm System Kit Easy-to-use and cost-effective D.I.Y. (do-it-yourself) wireless intruder alarm system kit. Supports up to 60 wireless sensors Transmit at 430-433MHz frequency band, wireless transmitting distance up to 300 feet Supports up to 5 phone numbers for auto alarm call & 1 management center protocol Easy one-key armed/disarmed operation.