Detect Intruders Or Visitors Protect Your Home/office/business This alarm works by having a pressure mat under the door mat & when someone steps on the mat, it triggers the alarm (or a chime) inside the building. it can therefore be used as an alarm or discreet doorbell. DOOR MAT ALARM - size 64 x 38cm This pressure activated door mat is a simple but effective and discrete method of adding additional security for your home, shop or office. It can be used anywhere, simply place under a doormat or carpet and when trodden on will activate either an alarm or chime sound. If the alarm mode is selected the siren will sound for approximately 20 seconds and then re-set itself. If the chime mode is selected it will sound twice. The pressure mat and alarm is connected with a 10m thin cable which can be extended if required. Around 750,000 homes are burgled every year, don't wait, BUY IT NOW!!!