A smoke cloak. I’ve been to a few B A activations where these have gone off and you can’t see your hand in front of your face. With a decent alarm inside, it’ll work well.
 
My thoughts too. These smoke canisters with added siren would be hugely disorienting for those thieving pikies/b'stards. Through in a few Bisley mines and a crack over the rear of skull with a badeball bat and they wouldn't be coming back.
 

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