Front Door
Get alerted every time your main door opens.
SIMPLE. WIRELESS. INSTANT.
Open a door. Hear the alarm.
BEST SELLER
SENTRI - Smart Intrusion Alarm
Door & Window Entry Sensor
$34.90
Get instantly alerted the moment a door or window opens. Choose a loud siren or a friendly chime — you're in control.
2 Sound Modes
120dB Siren
Peel & Stick
Free ShippingOn orders over $50
30-Day ReturnsHassle-free
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The SENTRI Smart Intrusion Alarm alerts you the instant a door or window opens — with a loud 120dB siren or a friendly ding-dong chime. Peel, stick, and you're protected in seconds.
- Two Sound Modes: Siren & Chime
- 120dB Loud Siren
- Peel & Stick — No Tools
- Wireless & Battery Powered
- Expandable System
- No Monthly Fees
Instant Alerts
Know the moment a door or window opens
120dB Loud Siren
Loud enough to scare off intruders
Two Sound Modes
Switch between siren & ding-dong chime
Peel & Stick
No tools, no wiring, no drilling
Expandable System
Add sensors to every entry point
No Monthly Fees
One-time purchase, lifetime protection
Protect Every Entry Point
Windows
Protect ground-floor and bedroom windows.
Garage
Know instantly when the garage is opened.
Sheds & Gates
Extend protection to outdoor storage.
Small Sensor. Big Protection.
Slim and discreet, the SENTRI sensor sticks to virtually any door or window in seconds.
120 dB
Siren Volume
2
Sound Modes
6 mo
Battery Life
Wireless
No Wiring
How It Works
- 1 PeelRemove the adhesive backing from the sensor.
- 2 StickAttach it to any door or window frame.
- 3 ProtectedOpen it and the siren or chime sounds instantly.
Why Choose SENTRI?
| Features | SENTRI Smart Sensor | Basic Door Chime | DIY Alarm Kit |
|---|---|---|---|
| Instant Open Alerts | Yes | Some | Some |
| Two Sound Modes (Siren + Chime) | Yes | No | Some |
| 120dB Loud Siren | Yes | No | Some |
| Peel & Stick — No Tools | Yes | Yes | No |
| Expandable System | Yes | No | Some |
| No Hub Required | Yes | Yes | No |
| Power Source | Battery | Battery | Wired |
| Monthly Fees | No | No | Some |
GOT QUESTIONS?
Frequently Asked Questions
How loud is the alarm?
The siren reaches a powerful 120dB — loud enough to alert your household and startle an intruder.
Does it need wiring or a hub?
No. It's completely wireless and battery powered — just peel, stick, and you're protected. No hub or app required.
Can I use it on windows too?
Yes. The sensor works on virtually any door, window, cabinet, or drawer with a flat surface.
How do I switch between siren and chime?
Short-press the SET button to select your preferred mode — a loud siren or a friendly ding-dong chime.
How long does the battery last?
Up to 6 months of everyday use on a single set of batteries, with a low-battery indicator.
Secure Every Door in Minutes.
Peel, stick, and stay protected — no tools, no wiring, no monthly fees.