Introduction
The Mr Beams MB800 LED Puck Light provides convenient, hands-free illumination for various areas in your home. This battery-operated light features motion activation, automatic shut-off, and a unique diffuser for a balanced light pattern. It is ideal for under cabinets, cupboards, closets, shelves, and other workspaces.
Product Features
- Brightness: Provides 30 lumens of bright white LED light.
- Motion and Light Sensors: Activates only when motion is detected in dark conditions.
- Auto Shut-Off: Automatically turns off after 20 seconds of no motion to conserve battery life.
- Wireless Installation: Easy setup in under 5 minutes using included mounting hardware or double-sided adhesive.
- Long Battery Life: Designed to provide approximately one year of light on each set of batteries (not included) with average use of 8 activations per night.
- Balanced Light: Unique diffuser creates a pleasing and even light pattern.
Setup and Installation
1. Battery Installation
The Mr Beams MB800 LED Puck Light requires three (3) AAA batteries (not included). Ensure correct polarity when inserting batteries.

A close-up view of a hand inserting three AAA batteries into the battery compartment of the Mr Beams MB800 LED Puck Light.
2. Mounting the Light
The puck light can be installed wirelessly in less than 5 minutes using either the included double-sided adhesive or screws. No wiring or electrician is needed.
- Choose a suitable location for the light, such as under a cabinet, shelf, or inside a closet.
- Clean the mounting surface thoroughly to ensure proper adhesion.
- Using Adhesive: Peel the backing from the double-sided adhesive and firmly press the mounting bracket onto the desired surface. Hold for 30 seconds.
- Using Screws: Use the provided screws to secure the mounting bracket to the surface.
- Once the bracket is secure, twist the puck light onto the bracket until it locks into place.

A Mr Beams MB800 LED Puck Light mounted under a kitchen cabinet, providing task lighting over a countertop.
Installation Demonstration Video
This video demonstrates the features of the Mr Beams MB800 LED Puck Light, including its motion activation, easy wireless installation, and balanced light pattern for various home applications like under cabinets, shelves, and cupboards.
Operating Instructions
The Mr Beams MB800 LED Puck Light is designed for automatic operation. It combines motion and light sensors to provide light only when needed.
- The light will activate when motion is detected within its range (up to 10 feet) and the ambient light conditions are dark enough.
- After 20 seconds of no motion, the light will automatically turn off to conserve battery power.
- For optimal performance, ensure the sensor is not obstructed and is positioned to detect motion in the desired area.

Multiple Mr Beams MB800 LED Puck Lights installed under shelves, providing bright, even illumination for decorative items and books.

A Mr Beams MB800 LED Puck Light installed on a pantry shelf, brightly illuminating food items and containers.

A Mr Beams MB800 LED Puck Light mounted above a closet rod, providing light for clothes hanging below.
Maintenance
Battery Replacement
When the light output diminishes or the light stops activating, it is time to replace the batteries. To replace batteries:
- Gently twist the puck light counter-clockwise to detach it from its mounting bracket.
- Open the battery compartment and remove the old AAA batteries.
- Insert three new AAA batteries, ensuring correct polarity (+/-).
- Close the battery compartment and twist the puck light back onto the mounting bracket until it clicks into place.
Cleaning
Wipe the light with a soft, damp cloth as needed. Do not use abrasive cleaners or immerse the unit in water.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Light does not turn on. |
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| Light turns off too quickly. |
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| Light is dim. |
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Specifications
- Model Number: MB800
- Light Output: 30 Lumens
- Power Source: 3 x AAA Batteries (not included)
- Motion Sensor Range: Up to 10 feet
- Auto Shut-Off: 20 seconds (no motion detected)
- Dimensions: Approximately 3.35 x 3.35 x 0.91 inches
- Material: Plastic
- Usage: Indoor
- Included Components: LED Puck Light, Mounting Hardware (adhesive/screws)
Warranty and Support
This Mr Beams MB800 LED Puck Light comes with a 1-year warranty against manufacturer defects from the date of purchase. Please retain your proof of purchase for warranty claims.
For technical support or warranty inquiries, please contact Mr Beams customer service through their official website or the retailer where the product was purchased.
