Having a burglar alarm but minus the deterrent of the flashing LED lights I decided to add some.
After a search online I found one of these AAA battery flashing LED units
So I attached the unit to the front of the box with double sided stick pads
The batteries should last some months, alkaline batteries do not like the cold – they fail to operate if it gets too chilly, I found this out when I had some AA’s LED christmas lights. Lithium batteries will not encounter this issue so I may change them if it does get very cold.