---
product_id: 1148495
title: "Safety Technology International, Inc. STI-6400 Exit Stopper Multifunction Door Alarm, Helps Prevent Unauthorized Exits or Entries Through Emergency Doors"
brand: "sti"
price: "€ 142.82"
currency: EUR
in_stock: true
category: "Sti"
url: https://www.desertcart.pt/products/1148495-safety-technology-international-inc-sti-6400-exit-stopper-multifunction-door
store_origin: PT
region: Portugal
---

# Long-life 9V alkaline battery 105 dB piercing alarm Virtually indestructible polycarbonate Safety Technology International, Inc. STI-6400 Exit Stopper Multifunction Door Alarm, Helps Prevent Unauthorized Exits or Entries Through Emergency Doors

**Brand:** sti
**Price:** € 142.82
**Availability:** ✅ In Stock

## Summary

> 🚪 Stop unauthorized exits before they happen — security that speaks loud and clear!

## Quick Answers

- **What is this?** Safety Technology International, Inc. STI-6400 Exit Stopper Multifunction Door Alarm, Helps Prevent Unauthorized Exits or Entries Through Emergency Doors by sti
- **How much does it cost?** € 142.82 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.pt](https://www.desertcart.pt/products/1148495-safety-technology-international-inc-sti-6400-exit-stopper-multifunction-door)

## Best For

- sti enthusiasts

## Why This Product

- Trusted sti brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Powerful Alarm:** 105 dB ear-piercing horn ensures instant alerts for any unauthorized door activity.
- • **Durable & Reliable:** Built with virtually indestructible polycarbonate housing backed by a 3-year breakage guarantee.
- • **Flexible Alarm Modes:** Choose from 10 beeps, 30 seconds, 3 minutes, or continuous alarm to fit your security needs.
- • **Unmissable Deterrent:** Highly visible stop sign design commands attention and prevents unauthorized access.
- • **Easy Override & Installation:** Key-operated silence override and versatile mounting options for any door setup.

## Overview

The STI-6400 Exit Stopper is a multifunction door alarm designed to prevent unauthorized exits or entries through emergency doors. Featuring a highly visible stop sign design and a powerful 105 dB alarm, it offers customizable alert durations and a key-operated override for authorized access. Built with virtually indestructible polycarbonate housing and powered by a long-life 9V alkaline battery, it guarantees durability with a 3-year breakage warranty. Easy to install on almost any door, this device is a cost-effective security solution trusted by professionals.

## Description

Product Description Safety Technology International, Inc. - STI 6400 Exit Stopper Multifunction Door Alarm. Helps prevent unauthorized exits or entries through emergency doors. If the protected door is opened, the electronic Exit Stopper (STI-6400) emits an ear piercing 105 dB warning horn, which will draw attention in a hurry. When activated, the alarm will continue for 30 seconds, three minutes or continuously (as preset by the user). A key operated override will silence the alarm and allow authorized exits. Another option is annunciator mode, in this mode it announces a doors opening with a set of 10 beeps and then resets. This highly visible “stop sign” design acts as a deterrent, completely self-contained and easy to install. May be mounted on top, right, left or next to almost any door. Exit Stopper is fitted with a long life 9-VDC alkaline battery. It is available in red or green for almost any type of door, mounting or installation. Has a 3 year guarantee against breakage of polycarbonate in normal use (one year on electro mechanical and electronic components). Safety Technology International, Inc. "We protect the things that protect you" From the Manufacturer Highly effective, alarm alerts you to any unauthorized exits or entries through emergency exit doors and rear doors. Serves as an inexpensive security device and helps stop theft as well. If the protected door is opened, the electronic Exit Stopper emits an ear piercing alarm for 10 beeps, 30 seconds, three minutes or continuously (as preset by the user). A key operated override will silence the alarm and allow authorized exits. Exit Stopper is fitted with a long life alkaline battery.

## Features

- Highly visible "stop sign" design acts as a deterrent
- Virtually indestructible polycarbonate housing
- Detects both unauthorized exits and entries
- Less expensive than heavy horizontal bar type units
- 3 year guarantee against breakage of polycarbonate in normal use (one year on electro mechanical and electronic components).

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0006AZDII |
| Audible Noise | 105 db |
| Battery Description | Alkaline |
| Best Sellers Rank | #9,555 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #2 in Industrial Warning Alarms |
| Brand | STI |
| Built-In Media | 9V Battery, Door Alarm, Reed/Magnet |
| Color | Red |
| Control Method | App, Touch |
| Customer Reviews | 4.7 4.7 out of 5 stars (519) |
| EU Spare Part Availability Duration | 3 years |
| Global Trade Identification Number | 00662950640004 |
| Item Dimensions L x W x H | 6.8"L x 2.7"W x 0.4"H |
| Item Type Name | Door Alarm |
| Manufacturer | Safety Technology Intl |
| Manufacturer Warranty Description | 3 year guarantee against breakage of polycarbonate in normal use (one year on electro mechanical and electronic components) |
| Mfr Part Number | STI-6400 |
| Model Number | STI-6400 |
| Mounting Type | Door Mount |
| Number of Batteries | 1 9V batteries required. (included) |
| Number of Items | 1 |
| Number of Packs | 1 |
| Power Source | Corded Electric |
| Sensor Technology | Contact Sensor |
| Size | 1 Pack |
| UPC | 662950640011 737214686613 662950640004 |
| Unit Count | 1 Count |
| Voltage | 9 volts |

## Product Details

- **Battery Description:** Alkaline
- **Brand:** STI
- **Color:** Red
- **Power Source:** Corded Electric
- **Product Dimensions:** 6.8"L x 2.7"W x 0.4"H

## Images

![Safety Technology International, Inc. STI-6400 Exit Stopper Multifunction Door Alarm, Helps Prevent Unauthorized Exits or Entries Through Emergency Doors - Image 1](https://m.media-amazon.com/images/I/71dEx4W3qvL.jpg)
![Safety Technology International, Inc. STI-6400 Exit Stopper Multifunction Door Alarm, Helps Prevent Unauthorized Exits or Entries Through Emergency Doors - Image 2](https://m.media-amazon.com/images/I/51P7cE2EuTL.jpg)
![Safety Technology International, Inc. STI-6400 Exit Stopper Multifunction Door Alarm, Helps Prevent Unauthorized Exits or Entries Through Emergency Doors - Image 3](https://m.media-amazon.com/images/I/41wUwD7AA0L.jpg)
![Safety Technology International, Inc. STI-6400 Exit Stopper Multifunction Door Alarm, Helps Prevent Unauthorized Exits or Entries Through Emergency Doors - Image 4](https://m.media-amazon.com/images/I/41QfCdW1eNL.jpg)
![Safety Technology International, Inc. STI-6400 Exit Stopper Multifunction Door Alarm, Helps Prevent Unauthorized Exits or Entries Through Emergency Doors - Image 5](https://m.media-amazon.com/images/I/41xLxw6p8NL.jpg)

## Available Options

This product comes in different **Style** options.

## Questions & Answers

**Q: Sti release a newly redesigned exit stopper door alarm on april 2018.   is this the newer version?**
A: The newer version STI-6400 2018 to current will have a red table of 8 switches, older models have switches labelled JP

**Q: How is it installed?**
A: Simple, just mount the magnet on the door frame and the main unit onto the doo.  When properly mounted and key switch is turned on, the opening of the door will pull the unit away from the magnet that then releases the internal read switch causing the siren to alert. MOUNTINGH:  Close the door then mount the magnet on the inside door frame at the opposite side of the hinges (opening).  Depending on the conditions, locate the magnet either at the top or side of the door frame near the door's surface but do allow a slight distance from the actual door surface so that it doesn't stop the door from closing.  Once it is mounted you will mount the main unit onto the actual door putting the read switch side of the unit so it is very close and lined-up evenly with the top of the magnet's surface.  You will need to disassemble the unit so as to mount the unit to the door as well as to insert or change the battery.  There are two types of keys for this unit, the metal type key has a fork end on it that fits into the screw head that holds unit together.  The gold keys (two) are used to turn on or shut off the unit.    You will need to have this gold key available to turn-off the unit or to turn on the unit.

**Q: Alarm goes off even when key is off. What am I doing wrong?**
A: Thank you for reaching out to STI.  Unit should not sound after key has been turned to the horizontal "off" position.  If this is happening you may want to check the key switch wires are still in the key switch terminal.  For further discussion on this please contact me direct Tasha/STI Tech Support/ 800-888-4784 x213.  Best Regards.

**Q: Can I order extra keys? We use these in a dorm each summer for a camp and we have lost ours.**
A: I had to order a new one to get the key.

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*Product available on Desertcart Portugal*
*Store origin: PT*
*Last updated: 2026-10-09*