Is this compatible with new B1381 Chamberlain led opener?

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.

Is this compatible with Chamberlain openers?

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.

Wiil this work on the Chamberlin B970?

NO, this will not work with the B970

How far does the box protrude laterally from the track? (e.g. what is the length of the plastic box with the bolt retracted?)

The box protrudes 7.200 from track. when in locked position the bolt protrudes .800 from inside surface of track

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Liftmaster 841LM Automatic Garage Door Lock

Product ID: 376621879

Details

Brand
LiftMaster
Colour
Black
Exterior finish
Steel
Material
Alloy Steel
Product dimensions
21.6L x 11.4W

📱Smartphone monitoring via myQ app

🔒Auto-locks with every door cycle

🛠️Precision screw-in alloy steel build

2506 kr

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Description

🔐 Lock in security, unlock peace of mind.

SEAMLESS AUTO SECURITY - Locks and unlocks automatically with your compatible LiftMaster opener for zero hassle.
SMARTPHONE PEACE OF MIND - Monitor your garage lock status anytime, anywhere with the myQ app—security in your pocket.
STORM READY DUAL DEFENSE - Add locks on both sides of your garage door to withstand high winds and deter intruders.
AUDIBLE LOCK CONFIRMATION - Hear the reassuring sound of your garage locking like a vault every time it closes.
PRECISION ENGINEERED COMPATIBILITY - Designed exclusively for select LiftMaster models (8550WL, 8587WL, 8360WL, 8500W) ensuring perfect integration.

The LiftMaster 841LM Automatic Garage Door Lock is a robust, alloy steel deadbolt that integrates seamlessly with select LiftMaster garage door openers to automatically lock and unlock your garage door. Featuring smartphone monitoring via the myQ app and audible lock confirmation, it offers enhanced security and convenience. Designed for easy screw-in installation, it provides dual-side locking options for superior protection against storms and intruders.

Specifications

ASIN	B074L9JQQR
Brand	LiftMaster
Brand Name	LiftMaster
Color	Black
Colour	Black
Customer Reviews	4.3 out of 5 stars 213 Reviews
Exterior Finish	Steel
Exterior finish	Steel
Global Trade Identification Number	00012381185740
Installation Type	Screw In
Installation type	Screw In
Item Dimensions L x W x H	21.6L x 11.4W x 10.9H centimeters
Manufacturer	Liftmaster/Chamberlain
Manufacturer Part Number	841lm & AOD Service Kit
Material	Alloy Steel
Material Type	Alloy Steel
Model Number	841lm
Number of Pieces	1
Product dimensions	21.6L x 11.4W x 10.9H centimeters
Recommended Uses For Product	Securing and locking/unlocking a garage door in conjunction with a compatible garage door opener
Shape	Rectangular
UPC	757347279797 012381185740
Unit Count	1.0 Count

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2506 kr

Duties & taxes included

In stock

Sold byAmazon DenmarkDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Denmark.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

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