"Welcome, welcome to the most magnificent emporium of magic items in this plane of existence. My name is Lucan, and whatever your party needs I will be able to provide - for the right price of course."
This week we have a special little item which can come in very handy when you are defending a location. I imagine you spend a lot of time breaking into places don't you? But there are those other times, I am sure, where you are the ones on guard duty? This really might help.
Here, why don't we discuss the specifics?"
Scroll of Alarm
Scroll, common
A particularly useful spell most often found in the hands of city or town guards. Enables an entire garrison to be woken instantly … woe betide it being used unnecessarily!
When read this scroll starts to announce an alarm sound or message, which is heard psychically by everyone within 500 ft.
People sleeping are automatically woken. Unconscious individuals are not affected.
Enchanted so that anyone capable of reading the text can activate the scroll.
Stats above are for Dungeons and Dragons 5th Edition