
Alarm Warning Window Decals (12-Pack)
Twelve vinyl decals. They say a 125 dB alarm will sound, because one will.
- Your alarms stop being invisibleThe decal is readable from the walkway, so the question gets answered before anyone is close to the window. What you installed inside finally shows up outside.
- It isn’t a bluffThe decal says a 125 dB alarm will sound. On a pane with a TremShield Alarm on it, that’s not a threat, it’s a description.
- Twelve panes, one packOne decal for every window you’ve alarmed, with spares for the panes still on your list. Front, back, basement, garage side door.
- Peel and press, either side of the glassPVC vinyl about 2.9 inches square with a removable adhesive. Inside the pane facing out, or on the outside if the glass is tinted.
What the street can see
Six alarms on the glass, and not one of them shows.
The alarm is a small white unit stuck to the inside of a pane. That’s the right place for it, because that’s where the vibration is. It also means the whole install is invisible from the yard. Somebody walking the block sees the same windows they saw last month, and the six alarms behind them change nothing about how the house is read from thirty feet away.
A warning decal is the only part of the setup that works at that distance. It says one short thing, in red on white, big enough to read without stopping: a 125 dB alarm will sound. Plenty of stickers in this category announce something the house can’t do, and a claim like that holds up only until somebody tests it. This one names the loudest thing the window can do.
Where they go is a five minute decision. Start with the panes that already have an alarm on them, then use the spares on the rest of the ground floor, because a house that warns you at one window and stays blank at the next has told you exactly which window to use. The decal is a statement about the building, not a contract about one piece of glass.
A sticker is a claim. Buy the one you can back up.

Face it out through the pane, or stick it on the outside.
Inside is the placement we’d pick. The decal faces out through the glass, so it reads from the walkway while the vinyl stays out of the weather and out of reach of anyone who wants to peel it off. On a tinted pane, a storm window, or a frame deep enough to hide it, put the decal on the outside instead and it reads clean.
Either way it’s the same 2.9 inch square of PVC vinyl on a removable adhesive, so nothing is permanent and nothing needs a tool. Rental windows are fine. When you move, the decal comes back off the glass and goes with you, along with the alarms.
Twelve panes, one lap of the house
Clean the glass
Wipe the spot with glass cleaner or rubbing alcohol and let it dry. Vinyl grips clean glass and slides on greasy glass.
Pick the corner
Eye level or a little above, in the corner nearest the path to that window, so it gets read from the walkway instead of from arm’s length.
Peel and press
Peel the backing, lay one edge down first, then press across the decal with your thumb to push the air out. It’s about 2.9 inches square, so it takes seconds.
Work the ground floor
Do the alarmed panes first, then the street side, then the back and the side door. Twelve decals covers a typical ground floor with a few left over.
The panes somebody would walk up to
Ground floor first: the windows either side of the front door, the back slider, the basement pane at ankle height, the garage side door nobody looks at. Those are the panes that get approached, so those are the ones worth marking. Upstairs windows can wait, and one on the inside of the front door glass is a fair use of a spare. US shipping is free and returns are open for 30 days, though at this price the real question is just where you want the warnings to sit.
The decal is the warning. The alarm is why it’s true.
A TremShield Alarm sticks to the inside of the glass and fires 125 dB at the first pry, before anyone is through the window. Six of them cover a ground floor for $99, which works out at $16.50 an alarm, and this pack puts a warning on every pane they sit behind, with spares for the ones you haven’t reached yet.
See the alarm
Questions, answered calmly
From the security guide
What Actually Deters Burglars? The Honest, Evidence-Based List
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