LiftMaster 821LMC-S myQ Smart Garage Control – Universal Wi-Fi Garage Door Controller

The LiftMaster 821LMC-S Smart Garage Control adds myQ smartphone connectivity to many existing garage door openers that do not have built-in Wi-Fi.

Once installed and connected to the myQ app, users can check garage door status, open or close the door remotely, receive real-time activity notifications, and create schedules from a compatible smartphone.

The kit includes one Wi-Fi hub and one wireless door-position sensor for controlling a single garage door. A second compatible sensor can be added to control a second garage door from the same hub.

### Product Features

- Genuine LiftMaster / myQ Smart Garage Control
- Model 821LMC-S / 821LMCS
- Adds smartphone control to many existing garage door openers
- Works with the myQ mobile app
- Remotely open and close the garage door
- Check garage door status from virtually anywhere
- Receive real-time open / close notifications
- Create garage door schedules
- Guest-access capability through myQ
- Controls up to 2 compatible garage doors
- Includes 1 door sensor
- Second door requires an additional 821LMC-SENSOR
- Supports up to 16 compatible myQ smart devices
- Wi-Fi and Bluetooth setup
- Compatible with many major opener brands manufactured after 1993
- No replacement of the existing garage door opener required

### Specifications

- Manufacturer: LiftMaster / Chamberlain Group
- Model: 821LMC-S
- Supplier Reference: 821LMCS
- Product Type: Smart Garage Door Controller
- Connectivity: Wi-Fi / Bluetooth
- App: myQ
- Garage Door Capacity: Up to 2
- Included Door Sensors: 1
- Maximum myQ Devices: Up to 16 compatible devices
- Installation: Indoor
- Color: White
- Warranty: 1-Year Limited Warranty

### What Is It Used For?

The 821LMC-S converts many existing garage door openers into smart, app-controlled systems.

After installation, users can use the myQ app to:

- Open the garage door
- Close the garage door
- Check whether the door is open or closed
- Receive garage-door activity alerts
- Create schedules
- Provide controlled guest access
- Monitor compatible myQ accessories

This is especially useful for older openers that still operate properly but do not have built-in Wi-Fi.

### Universal Garage Door Opener Compatibility

LiftMaster states that the Smart Garage Control works with many major brands of garage door openers manufactured after 1993 that use standard photoelectric safety sensors.

Compatibility depends on the exact opener model and safety-sensor configuration.

Before ordering, verify:

- Garage door opener manufacturer
- Opener model
- Manufacturing date
- Existing safety-sensor system
- myQ compatibility

Do not assume every opener manufactured after 1993 is compatible.

### Control Up to 2 Garage Doors

One Smart Garage Control hub can manage up to two compatible garage doors.

This kit includes:

- 1 Hub
- 1 Door Sensor

To control a second garage door, add:

LiftMaster 821LMC-SENSOR

The second sensor is sold separately.

### Smartphone Control

Once connected to Wi-Fi and the myQ app, the user can remotely monitor and control the garage door from a compatible smartphone.

Typical uses include:

- Checking whether the garage was left open
- Closing the garage remotely
- Opening the garage for a family member
- Receiving notifications when the door operates
- Checking garage activity while away from home

### Real-Time Alerts

The myQ app can provide notifications when the garage door:

- Opens
- Closes
- Is left open

Alert availability and app functionality may change as myQ services are updated.

### Scheduling

Users can create schedules for compatible garage door and myQ functions.

For example, the system can help ensure the garage door is closed at a selected time each evening.

### Guest Access

Compatible myQ Guest features allow users to share garage access with trusted individuals without giving them the homeowner’s primary account credentials.

Feature availability depends on the current myQ app and service configuration.

### Expandable myQ System

The 821LMC-S can support up to 16 compatible myQ devices, including select:

- Garage door sensors
- myQ lighting products
- myQ light controls
- Other compatible myQ accessories

### Package Contents

Includes:

- 1 – LiftMaster 821LMC-S Smart Garage Control Hub
- 1 – Wireless Garage Door Sensor
- 1 – Power Adapter
- 1 – Mounting Plate
- Installation Hardware

Additional door sensor, garage door opener, camera, smartphone, and Wi-Fi router are not included.

### Important Compatibility Note

This product does not replace the garage door opener.

It communicates with the existing opener and adds myQ smart-control capability.

Before ordering, confirm that your opener is compatible with the LiftMaster/myQ Smart Garage Control system.

Certain incompatible opener designs, safety-sensor configurations, or very old garage door openers may not work with this controller.

### Installation Requirements

Installation requires:

- Compatible garage door opener
- Active Wi-Fi connection
- Compatible smartphone
- myQ account
- Electrical outlet near the hub
- Properly operating photoelectric safety sensors

The hub should be mounted where it can maintain reliable communication with both the Wi-Fi network and garage door sensor.

### Important Safety Information

Remote garage door control should only be used when the garage door system is properly maintained and all safety equipment is functioning correctly.

Before using smartphone control, verify:

- Photo eyes operate correctly
- Automatic reversal functions correctly
- Door is properly balanced
- Door opening is clear of people, pets, vehicles, and objects

Never bypass garage door safety sensors or entrapment-protection equipment.