Go to Radio Shack in Santiago. It costs about $160 USD. You get a do it yourself install kit with a console, 2 motion detectors, 2 window/door alarms, 1 key ring remote control. You can also purchase additional door or window alarms as well as a key ring remote control, also light timers etc. I set mine up so the motion detectors cover the doors and windows. Currently there are 2 settings, one a simple ding dong for the alarm or a siren that makes you cover your ears. Each unit is battery driven(wireless), the console also has batteries but uses household power as primary power. Some options, you can program up to 7 telephone numbers and your own personal message to call should the alarm trip. I call my cell number and 2 neighbors. when you recieve the alert you can listen in to your house via the console for any noise. The cops don't like these programmed to call them, due to false alarms.