Add extra security to any Dowco WeatherAll Plus Cover or Dowco ATV Cover. The alarm features a battery-powered pin-pull that emits an ultra loud tone activated by unauthorized movement of the cover. The alarm is hidden underneath cover so only you know that alarm is there.; Emits an ~130dB warning when cover is removed Battery-powered (9-volt, not included) no special wiring required Installs in minutes with no tools Patented