They keep pests away from your home walls, too. For a few hundred dollars you can install a burglar alarm system in your house. For better protection, you can have a monitored alarm system from a security system professional . Monitored alarm systems respond to break-ins by notifying the police or fire departments. Monitored systems cost for installation and a monthly service charge, but also help reduce some insurance costs.
Many systems also have panic buttons for instant calls of help.
When turned on the emit a loud shreak to hopefully scare off burglars. For as little as five dollars some protection is afforded. Keep personal alarms by the entries and by your bed. A motion detector senses motion over a 180 degree field. You can adjust the sensitivity.