# Liftmaster MyQ Additional Door Sensor for Smart Garage Control HUB

The LiftMaster 821LMC-SENSOR is an additional door sensor designed for use with Smart Garage Control, myQ Smart Garage Hub, and myQ Garage. This sensor allows users to add control of a second garage door opener to their existing Smart Garage setup. It offers the capability to secure, control, and monitor a second garage door through the myQ app, enhancing the overall security and convenience of the garage system.

## Key Features and Specifications:

-   **Compatibility:** Compatible with Smart Garage Control, Smart Garage Hub, and myQ Garage. Requires the purchase of the Smart Garage Control or Smart Garage Hub (sold separately).
-   **Ease of Use:** Designed for easy installation and programming.
-   **App Integration:** Enables users to check the status and control two garage doors using the myQ app.
-   **Dimensions:** Measures W 2-5/8" x H 2-5/8" x D 7/8".
-   **Warranty:** 1-year accessory warranty.

##### Compatibility

The LiftMaster 821LMC-SENSOR is compatible with Smart Garage Control, Smart Garage Hub, and myQ Garage. However, it's important to note that it requires the purchase of the Smart Garage Control (Models: 821LMC and MYQ-G0401), or the Smart Garage Hub 1st generation (Models: 821LM & MYQ-G0201) and 2nd generation (Models: 821LMB & MYQ-G0301), each sold separately. Each Hub can control up to two garage door openers  

##### Instructions

Programming Instructions:

[LiftMaster Smart Garage Control Owner's Manual](https://cdn.shopify.com/s/files/1/1499/9402/files/821LMC-1.pdf?v=1701201155 "LiftMaster Smart Garage Control Owner's Manual")  
[myQ Smart Garage Control Door Sensor Quick Start Guide](https://cdn.shopify.com/s/files/1/1499/9402/files/821LMC-Sensor.pdf?v=1701201154 "myQ Smart Garage Control Door Sensor Quick Start Guide")

## Details

- **Price:** 43.99 USD
- **Vendor:** Liftmaster

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 43.99 USD | In stock |

## Images

- LiftMaster 821LMC-SENSOR hub with myQ logo in white.
- Front angle view of the myQ LiftMaster 821LMC-SENSOR
- Side view of the LiftMaster myQ 821LMC-SENSOR showing the sleek profile
- LiftMaster myQ 821LMC-SENSOR with mounting brackets
- Retail packaging of LiftMaster 821LMC-SENSOR with product information.
- Back of LiftMaster 821LMC-SENSOR packaging highlighting the features and installation guide.

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> Source: [Express Garage Doors](https://www.expressgaragedoors.com/products/liftmaster-myq-additional-door-sensor-for-smart-garage-control-hub)
> Updated: 2026-07-26