---
product_id: 287879057
title: "STI Safety Technology International, Inc. -6400 Exit Stopper Multifunction Door Alarm, Helps Prevent Unauthorized Exits or Entries Through Emergency Doors"
brand: "sti"
price: "€ 142.18"
currency: EUR
in_stock: true
reviews_count: 6
category: "Sti"
url: https://www.desertcart.de/products/287879057-sti-safety-technology-international-inc-6400-exit-stopper-multifunction-door
store_origin: DE
region: Germany
---

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

**Brand:** sti
**Price:** € 142.18
**Availability:** ✅ In Stock

## Summary

> 🚨 Stop threats before they start with the STI 6400 Exit Stopper!

## Quick Answers

- **What is this?** STI Safety Technology International, Inc. -6400 Exit Stopper Multifunction Door Alarm, Helps Prevent Unauthorized Exits or Entries Through Emergency Doors by sti
- **How much does it cost?** € 142.18 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.de](https://www.desertcart.de/products/287879057-sti-safety-technology-international-inc-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

- • **Peace of Mind Guaranteed:** Backed by a 3-year polycarbonate breakage warranty and 1-year electronics coverage.
- • **Customizable Alarm Duration:** Choose from 30 seconds, 3 minutes, or continuous alarm to fit your security needs.
- • **Built to Last, Built to Protect:** Rugged polycarbonate housing resists damage, ensuring reliable security day after day.
- • **Stop Unauthorized Access Instantly:** 105 dB alarm grabs attention fast, deterring intruders and preventing unauthorized exits.
- • **Effortless Installation & Versatility:** Mounts easily on almost any door—top, side, or next to the door for maximum coverage.

## Overview

The STI 6400 Exit Stopper is a multifunction door alarm designed to prevent unauthorized exits and entries through emergency doors. Featuring a loud 105 dB alarm, durable polycarbonate housing, and flexible mounting options, it offers customizable alarm durations and a key-operated override for authorized access. Powered by a long-life 9V alkaline battery and backed by a 3-year warranty, it’s a reliable, cost-effective security solution for professional environments.

## 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"

Review: Good Quality Product - Good Quality Product
Review: Sold as advertised A+

## 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 |
| ASIN  | B0006AZDII |
| Batteries | 1 9V batteries required. (included) |
| Batteries  | 1 9V batteries required. (included) |
| Batteries Included? | Yes |
| Batteries Required? | Yes |
| Battery Cell Type | Alkaline |
| Best Sellers Rank | #17,355 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #15 in Home Alarm Systems |
| Color | Red |
| Control method | Touch |
| Customer Reviews | 4.6 4.6 out of 5 stars (487) |
| Customer reviews | 4.6 4.6 out of 5 stars (487) |
| Date First Available | 11 August 2012 |
| Date First Available  | 11 August 2012 |
| Department  | Safety Hardware |
| Global Trade Identification Number | 00662950640004 |
| Included components | 9V Battery, Door Alarm, Reed/Magnet |
| Is Discontinued By Manufacturer  | No |
| Item Package Quantity | 1 |
| Item Weight | 454 g |
| Item model number | STI-6400 |
| Item model number  | STI-6400 |
| Item weight | 454 g |
| Manufacturer | Safety Technology Intl |
| 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 |
| Product Dimensions | 17.27 x 6.86 x 1.02 cm; 453.59 g |
| Product Dimensions  | 17.27 x 6.86 x 1.02 cm; 453.59 g |
| Sensor technology | Contact Sensor |
| Size | 1 Pack |
| Style | Stopper |
| UPC | 737214686613 662950640011 662950640004 |
| Voltage | 9 Volts |
| tech_spec_battery_description_toys | Alkaline |

## Product Details

- **Battery description:** Alkaline
- **Brand:** STI
- **Colour:** Red
- **Power source:** Battery Powered
- **Product dimensions:** 17.3L x 6.9W x 1H centimeters

## Images

![STI Safety Technology International, Inc. -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)

## 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

### ⭐⭐⭐⭐⭐ Good Quality Product
*by S***H on 17 January 2026*

Good Quality Product

### ⭐⭐⭐⭐⭐ Review
*by J***T on 18 March 2024*

Sold as advertised A+

### ⭐⭐⭐⭐⭐ Review
*by J***R on 14 August 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.

## Frequently Bought Together

- Safety Technology International, Inc. STI-6400 Exit Stopper Multifunction Door Alarm, Helps Prevent Unauthorized Exits or Entries Through Emergency Doors
- SmartSign (Pack of 4) 5 x7 inch “Emergency Exit Only - Security Alarm Will Sound If Door is Opened” Sticker Labels, 5 mil Laminated Polyester with SuperStick Adhesive, Red and White, Made in USA
- Safety Technology International, Inc. STI-6402 105 dB Exit Stopper® Multifunction Door Alarm for Double Doors with on/off Switch and 9 Volt Battery

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*Product available on Desertcart Germany*
*Store origin: DE*
*Last updated: 2026-03-08*