---
product_id: 5007137
title: "Safety Technology International, Inc. STI-6402 105 dB Exit Stopper® Multifunction Door Alarm for Double Doors with on/Off Switch and 9 Volt Battery, red"
brand: "sti"
price: "$286.60"
currency: USD
in_stock: true
reviews_count: 13
category: "Sti"
url: https://www.desertcart.ec/products/5007137-safety-technology-international-inc-sti-6402-105-db-exit-stopper
store_origin: EC
region: Ecuador
---

# 105 dB piercing alarm 9V long-life alkaline battery Easy DIY installation Safety Technology International, Inc. STI-6402 105 dB Exit Stopper® Multifunction Door Alarm for Double Doors with on/Off Switch and 9 Volt Battery, red

**Brand:** sti
**Price:** $286.60
**Availability:** ✅ In Stock

## Summary

> 🚪🔐 Stop unauthorized exits before they happen — loud, clear, and impossible to ignore!

## Quick Answers

- **What is this?** Safety Technology International, Inc. STI-6402 105 dB Exit Stopper® Multifunction Door Alarm for Double Doors with on/Off Switch and 9 Volt Battery, red by sti
- **How much does it cost?** $286.60 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.ec](https://www.desertcart.ec/products/5007137-safety-technology-international-inc-sti-6402-105-db-exit-stopper)

## 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

- • **Complete Security Kit:** Includes tamper wrench, activation keys, reed switches, magnets, and door alarm labels for professional-grade setup.
- • **Plug & Play Protection:** Self-contained unit with included mounting hardware for effortless installation on double doors.
- • **Customizable Alert Modes:** Choose between 30 seconds, 3 minutes, continuous alarm, or annunciator beep mode for tailored security.
- • **Unmatched Audible Security:** 105 dB alarm ensures no unauthorized exit goes unnoticed, creating a secure environment.
- • **Durable & Weather-Resistant:** UV-stabilized polycarbonate housing built to withstand sun exposure and daily wear.

## Overview

The STI-6402 Exit Stopper® is a high-decibel multifunction door alarm designed for double doors, delivering a powerful 105 dB alert to prevent unauthorized exits or entries. Featuring easy installation, customizable alarm durations, and a durable UV-stabilized polycarbonate housing, it operates on a long-life 9V alkaline battery and includes all necessary mounting and security accessories. Ideal for emergency and rear doors, it offers professional-grade security with user-friendly control and tamper-resistant features.

## Description

Safety Technology International, Inc. STI-6402 Exit Stopper Multifunction Door Alarm for Double Doors - Highly effective, alarm alerts to any unauthorized exits/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 for double doors emits a 95/105 ear piercing alarm for 30 seconds, three minutes or continuously. 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. Should not be exposed to water. Exit Stopper is fitted with a long life 9-VDC alkaline battery. Highly visible "stop sign" design and complete with double reed switch assembly to monitor double doors. Mounts easily next to any door, 9-VDC alkaline battery, screws and anchors included. Housing is molded of super tough polycarbonate and is UV-stabilized for minimal damage from the sun. Recommended operating temperature 32°F to 113°F (0°C to 45°C). Note: End user must verify the alarm and battery function every six months and replace battery annually or as required. STI "We protect the things that protect you."

Review: Works very Well!! - Its very usefull to install in emergency doors! Have a good control and has a easy instalation.
Review: Simple to install - Took only 35 min to put on fire escape door! No more folks sneaking out!

## Features

- Alarm alerts to unauthorized exits or entries through protected doors
- Unit is completely self-contained and easy to install
- Sounds a powerful 95 or 105 db alarm when Activated
- May be mounted on top, right, left or next to almost any door
- Dimensions - 5 in. diameter x 1.875 in. depth

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0015Q7XQM |
| Batteries | 1 9V batteries required. (included) |
| Batteries Included? | Yes |
| Batteries Required? | Yes |
| Battery Cell Type | Alkaline |
| Best Sellers Rank | #396 in Home Security Systems |
| Control Method | App, Touch |
| Customer Reviews | 4.6 4.6 out of 5 stars (131) |
| Date First Available | March 10, 2008 |
| Description Pile | Alkaline |
| Global Trade Identification Number | 00662950640202 |
| Included Components | Mounting Screws (12)^Tamper Wrench^9V battery^Reed Switch(2)^Magnet(2)^Tamperproof Screw^Key Ring^Activation Key (2)^Door Alarmed label^Anchors (12)^Spacers (8)^Door alarm unit^Installation instructions |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 12.8 ounces |
| Item model number | STI-6402 |
| Manufacturer | Safety Technology International, Inc |
| Mounting Type | Door Mount |
| Noise Level | 105 Decibels |
| Number Of Pieces | 1 |
| Part Number | 6402 |
| Product Dimensions | 5.38 x 5.38 x 2 inches |
| Sensor Technology | Contact Sensor |
| Style | Alarm |
| UPC | 662950640202 |
| Voltage | 9 Volts |

## Product Details

- **Battery Description:** Alkaline
- **Brand:** STI
- **Color:** 2
- **Number of Batteries:** 1 9V batteries required. (included)
- **Power Source:** Battery Powered

## Images

![Safety Technology International, Inc. STI-6402 105 dB Exit Stopper® Multifunction Door Alarm for Double Doors with on/Off Switch and 9 Volt Battery, red - Image 1](https://m.media-amazon.com/images/I/61QQqshHzRL.jpg)

## Available Options

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

## Questions & Answers

**Q: Dose it come with the key?**
A: Our STI-6400 comes with 2 KIT-H19032 alarm keys (2341) and 2 KIT-H19016 service screw key

**Q: where is this made?**
A: Taiwan

**Q: How do you shut off the short loud signal every minute or two  that is obnoxious and assume is meant to indicate battery working?**
A: That could indicate you have a low battery.  Shut-off the unit and then replace the internal 9V battery.  Then you can turn the unit back on and the indicator should go away.  If you need instructions on how to do this let visit our website and you can access the installation sheet.  Or email us at sales@sti-usa.com.

**Q: If the door is opened in an emergency do the wires break away and if so can they be placed back?**
A: The STI-6402 goes into alarm after given it's NC simulation.  With the STI-6402 there will be (1) reed on board wired into the RS1 for the second door you will attach the additional reed in the hardware pack into the RS2.  Each door will need to have the extra magnet along side each reed (wired magnet) and when they separate it goes into alarm.   There is no disconnection of wires - visit this link to view it's install https://www.sti-usa.com/wp-content/uploads/6400Install.pdf.  For more information you can reach out to STI tech support, support@sti-usa.com.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Works very Well!!
*by D***Z on October 25, 2023*

Its very usefull to install in emergency doors! Have a good control and has a easy instalation.

### ⭐⭐⭐⭐⭐ Simple to install
*by D***H on August 24, 2023*

Took only 35 min to put on fire escape door! No more folks sneaking out!

### ⭐⭐⭐⭐⭐ Good inexpensive alarm
*by V***6 on July 14, 2022*

I put this alarm product on an outbuilding as a door alarm, using the alarm extension as a door trigger and mounting the box next to the door. The basic electronic design allows for a number of configurations and you can use it to trip outboard visual alarms with the onboard NO/NC relay contacts. Over and above using it for alarming a secured exit door it is versatile enough to create a multi sensor basic alarm system. If you had the motivation, you could use it for a two zone home alarm system. Works as an entry alarm as well as an exit alarm.

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*Product available on Desertcart Ecuador*
*Store origin: EC*
*Last updated: 2026-02-25*