---
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: "A$174"
currency: AUD
in_stock: true
reviews_count: 13
category: "Sti"
url: https://www.desertcart.com.au/products/1148495-safety-technology-international-inc-sti-6400-exit-stopper-multifunction-door
store_origin: AU
region: Australia
---

# 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:** A$174
**Availability:** ✅ In Stock

## Summary

> 🚨 Stop unauthorized exits before they happen — security that speaks volumes!

## 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?** A$174 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/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

- • **Built to Last:** Rugged polycarbonate housing ensures durability and a 3-year breakage guarantee for peace of mind.
- • **Flexible Installation:** Mounts easily on any door orientation with adjustable reed/magnet sensor for perfect fit.
- • **Loud & Clear Deterrence:** 105 dB alarm instantly commands attention, stopping unauthorized exits in their tracks.
- • **User-Controlled Security:** Key-operated override and multiple alarm duration settings put control in your hands.
- • **Cost-Effective Protection:** More affordable than heavy-duty bar units without compromising on high-impact security.

## Overview

The STI-6400 Exit Stopper is a compact, highly visible door alarm designed to prevent unauthorized exits or entries through emergency doors. Featuring a piercing 105 dB alarm, virtually indestructible polycarbonate housing, and flexible mounting options, it offers professional-grade security with a 3-year housing warranty. Powered by a standard 9V alkaline battery and equipped with a key override, it’s an affordable, reliable solution trusted by businesses to safeguard critical access points.

## 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.

Review: 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.
Review: Perfectly fits the purpose intended. - This unit was purchased to be an alarm for an exit door at a charity business which needed to be monitored it's use. The device is easy to install, easy to replace the battery on, and sensor can be put in any one of multiple positions to allow a variety of installation configurations. Uses standard 9 volt batteries or it can be powered with an AC adapter.

## 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 |
| Batteries | 1 9V batteries required. (included) |
| Batteries Included? | Yes |
| Batteries Required? | Yes |
| Battery Cell Type | Alkaline |
| Best Sellers Rank | #9,028 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1 in Industrial Warning Alarms |
| Control Method | App, Touch |
| Customer Reviews | 4.7 4.7 out of 5 stars (499) |
| Date First Available | October 26, 2005 |
| Description Pile | Alkaline |
| Global Trade Identification Number | 00662950640004 |
| Included Components | 9V Battery, Door Alarm, Reed/Magnet |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 1 pounds |
| Item model number | STI-6400 |
| Manufacturer | Safety Technology Intl |
| Material | Polycarbonate |
| Mounting Type | Door Mount |
| Noise Level | 105 Decibels |
| Number of Batteries | 1 9V batteries required. (included) |
| Part Number | STI-6400 |
| Sensor Technology | Contact Sensor |
| Size | 1 Pack |
| Style | Stopper |
| UPC | 737214686613 662950640011 662950640004 |
| Voltage | 9 Volts |
| Warranty Description | 3 year guarantee against breakage of polycarbonate in normal use (one year on electro mechanical and electronic components) |

## Product Details

- **Battery Description:** Alkaline
- **Brand:** STI
- **Color:** Red
- **Power Source:** Battery Powered, dc
- **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)

## 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.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Small alarm but gets it done
*by J***R on August 14, 2020*

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.

### ⭐⭐⭐⭐⭐ Perfectly fits the purpose intended.
*by M***R on January 24, 2024*

This unit was purchased to be an alarm for an exit door at a charity business which needed to be monitored it's use. The device is easy to install, easy to replace the battery on, and sensor can be put in any one of multiple positions to allow a variety of installation configurations. Uses standard 9 volt batteries or it can be powered with an AC adapter.

### ⭐⭐⭐⭐⭐ Great alarm system
*by S***R on October 14, 2024*

Great alarm system for security and/or fire safety. READ ALL INSTRUCTIONS CAREFULLY! Before you try to set the DIP switches inside the alarm, make sure you understand the settings. Never discard those instructions! Many settings available depending on what you want. DO NOT use a graphite for moving the DIP switches. You risk breaking inside the switch. They are not hard to move up or down. Just exercise caution and know where you want them set BEFORE you start. The magnet can be moved to your desired spot. Test the magnet before you start drilling to your door or wall.

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*Product available on Desertcart Australia*
*Store origin: AU*
*Last updated: 2026-02-18*