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🚪 Stop unauthorized exits before they happen — security that speaks volumes!
The STI 6400 Exit Stopper is a multifunction door alarm designed to prevent unauthorized exits or entries through emergency doors. Featuring a loud 105 dB alarm with customizable duration settings and a highly visible stop sign design, it deters misuse effectively. Its virtually indestructible polycarbonate housing and long-life 9V battery ensure reliable, low-maintenance operation. Easy to install on nearly any door, it comes with a 3-year guarantee on the housing and a 1-year warranty on electronic components, making it a trusted choice for professional-grade security.







| ASIN | B0006AZDII |
| Audible Noise | 105 Decibels |
| Battery Description | Alkaline |
| Battery description | Alkaline |
| Best Sellers Rank | #20,165 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #20 in Home Alarm Systems |
| Brand | STI |
| Built-In Media | 9V Battery, Door Alarm, Reed/Magnet |
| Color | Red |
| Colour | Red |
| Control Method | Touch |
| Customer Reviews | 4.7 out of 5 stars 495 Reviews |
| EU Spare Part Availability Duration | 3 Years |
| Global Trade Identification Number | 00662950640004 |
| Item Dimensions L x W x H | 17.3L x 6.9W x 1H centimeters |
| Item Type Name | Door Alarm |
| Item Weight | 1.15 Pounds |
| Manufacturer | Safety Technology Intl |
| Mfr Part Number | STI-6400 |
| Model Number | STI-6400 |
| Mounting Type | Door Mount |
| Number of Batteries | 1 9V batteries required. (included) |
| Number of batteries | 1 9V batteries required. (included) |
| Power Source | Battery Powered |
| Power source | Battery Powered |
| Product dimensions | 17.3L x 6.9W x 1H centimeters |
| Sensor Technology | Contact Sensor |
| Size | 1 Pack |
| Smart Home Compatibility | Not Smart Home Compatible |
| UPC | 737214686613 662950640011 662950640004 |
| Unit Count | 1 Count |
| Voltage | 9 Volts |
S**H
Good Quality Product
Good Quality Product
J**T
Sold as advertised A+
Sold as advertised A+
J**R
Small alarm but gets it done
I meant to take pics and forgot. First it's much SMALLER than I thought - you know it "looked bigger in the picture". However this little thing is much louder than the one we were replacing. Upside it uses a standard 9v battery so no weird battery combos. We used this on an metal emergency exit in a retail space that was about 120' from the cash registers. Now everyone can hear if someone tries to slip out that door into the parking lot. It has an internal reed/magnet setup that works like a lego block and can be moved around the inside of the unit to wherever the magnet contact is on the door. My only suggestion - the screws are pretty much for a wood door setup so save a headache and grad some self-tapping metal screws if using on a metal door and/or door jamb. Happy so far but it's only been installed a few days. I would only update this if it dies in the first year based on the price alone.
R**A
الجودة
التوصيل كان سريع والشحنة مناسبة للعمل وذات جودة ممتازه
R**N
Excellent!
Exactly what I wanted. Can't buy a better door alarm for this price level. Was easy to install and works perfectly. Lots of adjustable options. Works well for restaurant emergency exit door.
J**R
OK
Muy útil
Trustpilot
2 months ago
5 days ago