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Here is an extremely loud wireless alarm that you can use to keep your home safe. The SABRE 120dB Door Stop Alarm can be heard from 1500ft away. It has a non-skid pad to prevent your door from opening while the alarm sounds. It runs on a 9V battery. This alarm keeps going until it is turned off via its on/off switch.
This alarm is loud enough to be heard across 4 football fields. It can be installed in seconds. You can find out more about it here.