Alarm System
433 MHz system example
http://www.ebay.ca/itm/2016-DIY-KERUI-Wireless-W2-WiFi-GSM-PSTN-Home-Alarm-System-Wireless-Accessories-/301969901273
Long range transmitter
http://www.rapidrelays.com/long-range-wireless-transmitter-for-single-channel-relay/