---
product_id: 376621879
title: "841LM Automatic Garage Door Lock"
brand: "liftmaster"
price: "NT$14250"
currency: TWD
in_stock: true
url: https://www.desertcart.tw/products/376621879-841lm-automatic-garage-door-lock
store_origin: TW
region: Taiwan
---

# Auto-Lock Feature 12V Compatibility Storm Defense 841LM Automatic Garage Door Lock

**Brand:** liftmaster
**Price:** NT$14250
**Availability:** ✅ In Stock

## Summary

> 🔑 Unlock peace of mind with every lift!

## Quick Answers

- **What is this?** 841LM Automatic Garage Door Lock by liftmaster
- **How much does it cost?** NT$14250 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.tw](https://www.desertcart.tw/products/376621879-841lm-automatic-garage-door-lock)

## Best For

- liftmaster enthusiasts

## Why This Product

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

## Key Features

- • **Weather Warrior:** Add locks for enhanced protection against high winds and intruders.
- • **Seamless Security:** Automatically locks with every door operation for peace of mind.
- • **Sleek Modern Design:** Polished finish complements any garage aesthetic.
- • **Robust Compatibility:** Designed for select LiftMaster models, ensuring a perfect fit.
- • **Lightweight & Efficient:** Weighing only 1.36 kg, it’s easy to install without hassle.

## Overview

The LiftMaster 841LM Automatic Garage Door Lock is a cutting-edge security solution designed to work seamlessly with select LiftMaster garage door openers. Weighing just 1.36 kg and featuring a sleek, modern design, this 12V lock enhances your garage's security by automatically locking and unlocking with each door operation. Ideal for homeowners looking to bolster their defense against storms and intruders, the 841LM is a must-have for modern living.

## Description

841LM Automatic Garage Door Lock

## Features

- The 841LM works automatically with your garage door opener so it always locks and unlocks with every operation of the door.
- The model 841LM 12V lock is only compatible with the following garage door opener model numbers: 8550WL, 8587WL, 8360WL, 8500W.
- It is not interchangeable with the 24V lock used on residential jackshaft garage door opener models 3800, 3900 and 8500.
- Add a lock to each side of the door for the best defense against high winds and storms and intruders

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Global Trade Identification Number | 00012381185740 |
| Number of pieces | 1 |
| Manufacturer | Liftmaster/Chamberlain |
| Part number | 841lm & AOD Service Kit |
| Item Weight | 1.36 Kilograms |
| Product Dimensions | 21.59 x 11.43 x 10.92 cm; 1.36 kg |
| Item model number | 841lm |
| Style | Modern |
| Finish | Polished |
| Shape | Rectangular |
| Item Package Quantity | 1 |
| Special Features | Auto-Lock |
| Batteries Included? | No |
| Batteries Required? | No |
| tech_spec_battery_description_toys | Lithium |

## Product Details

- **Material:** Alloy Steel
- **Brand:** LiftMaster
- **Installation type:** Screw In
- **Recommended uses for product:** Securing and locking/unlocking a garage door in conjunction with a compatible garage door opener
- **UPC:** 757347279797 012381185740

## Images

![841LM Automatic Garage Door Lock - Image 1](https://m.media-amazon.com/images/I/414Nl84FrcL.jpg)

## Questions & Answers

**Q: Is this compatible with new B1381 Chamberlain led opener?**
A: Yes it is. I purchased the B1381 in Dec 2019 and it has the security shield symbol on the cover ( it is a shield with half light and half dark divided diagonally). It also has two lock connectors on the unit next to the up and down adjustment buttons close to where you connect the wires for the sensors and control panel and the WiFi learn button. Since it has two lock connectors if you want you can connect two of these locks, one on each side of your door.

**Q: Is this compatible with Chamberlain openers?**
A: It is compatible with at least some some Chamberlain openers.  Liftmaster and Chamberlain are the same company. To know if yours is compatible the two requirements are for it to have the shield symbol on the cover and for there to be two lock connectors on the unit next to the up and down adjustment buttons. I have the Chamberlain B1381 and it is compatible.

**Q: Wiil this work on the Chamberlin B970?**
A: NO, this will not work with the B970

**Q: How far does the box protrude laterally from the track? (e.g. what is the length of the plastic box with the bolt retracted?)**
A: The box protrudes 7.200 from track. when in locked position the bolt protrudes .800 from inside surface of track

## Frequently Bought Together

- Liftmaster 841LM Automatic Garage Door Lock
- LIFTMASTER 8900W Light-Duty Commercial JACKSHAFT Operator W/Built-in WI-FI for SECTIONAL Doors LJ8900W
- New LiftMaster 485LM Battery Backup for Garage Door Openers 3840 3850 8360 8550

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.tw/products/376621879-841lm-automatic-garage-door-lock](https://www.desertcart.tw/products/376621879-841lm-automatic-garage-door-lock)

---

*Product available on Desertcart Taiwan*
*Store origin: TW*
*Last updated: 2026-02-03*