This unit to prevent intruders, that only cost's $12.95, is called the Pro-Tec Door Alarm and it works on both metal, wood or plastic door knobs. If you have a metal door knob, it will sense if it's being touched. If it's a wood or plastic knob, it will sense vibration. It can also be used as a regular chime, to let you know that your door is being opened, without setting off the alarm. Plus when the Pro-Tec Door Alarm's batteries are getting weak, it will beep to let you know the batteries need changing.
The affordable unit for only $12.95, as mentioned before, is perfect for your home, hotel room or college dorm. It uses 3 AAA batteries that are not included. The batteries last approximately 1500 hours on standby mode. Alarm pitch sound is 110dB and it will definitely let you know if you have a potential intruder!
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