Introduction
Thank you for choosing the SURFOU Wireless Doorbell N82K. This system includes two transmitters and one plug-in receiver, designed for ease of use and reliable performance. It features a waterproof design, long wireless range, multiple melodies, adjustable volume, and a memory function to retain your settings. This manual provides detailed instructions for installation, operation, and maintenance to ensure optimal performance.

Image: Overview of the SURFOU Wireless Doorbell N82K system, showing the transmitter and receiver units.
Package Contents
Please verify that all items are present in your package:
- 2 × Transmitter (battery included)
- 1 × Plug-in Receiver
- 2 × Door Sign
- 3 × Adhesive Tape
- 2 × Screwdriver Kit
- 1 × User Manual (this document)
Setup
1. Transmitter Installation
The transmitter can be installed using either the provided double-sided adhesive tape or screws.
- Adhesive Tape Method: Clean the desired installation surface thoroughly. Peel off one side of the protective film from the double-sided adhesive tape and attach it to the back of the transmitter. Peel off the other side and firmly press the transmitter onto the clean surface for at least 30 seconds.
- Screw-In Method: Open the back cover of the transmitter. Mark the positions for drilling holes using the transmitter as a template. Drill two holes, insert the wall anchors (if necessary), and secure the transmitter to the wall using the provided screws and screwdriver. Close the back cover.
Ensure the transmitter is placed in a location where it is easily accessible and visible to visitors.
2. Receiver Installation
Simply plug the receiver into any standard electrical outlet within range of the transmitter. For optimal performance, choose a central location or a location where the doorbell sound is easily heard.

Image: Illustration showing the two installation methods for the transmitter: adhesive tape and screws.
Operating Instructions
1. Changing Melodies
The receiver offers 55 different melodies. To change the melody:
- Press the "Music Selection" button on the side of the receiver to cycle through the available melodies.
- Once you hear a melody you prefer, stop pressing the button. The receiver will automatically save this selection due to its built-in memory function.
2. Adjusting Volume
The receiver has 5 adjustable volume levels, ranging from silent (mute mode) to 110 dB.
- Press the "Volume" button on the side of the receiver to cycle through the volume levels.
- Continue pressing until you reach your desired volume. The mute mode is indicated by a specific LED flash pattern or lack of sound.
3. Pairing Additional Transmitters/Receivers (Multiple Learning Codes)
The system supports pairing with additional SURFOU wireless doorbell sets for expanded coverage.
- Plug in the receiver you wish to pair.
- Press and hold the "Volume" button on the receiver for approximately 5 seconds until the LED indicator flashes rapidly. This indicates it is in pairing mode.
- Within 10 seconds, press the button on the transmitter you want to pair. The receiver will chime, indicating successful pairing.
- Repeat for any additional transmitters.

Image: The plug-in receiver highlighting its features: 55 melodies, LED indication, memory function, and 5 volume levels.

Image: Diagram illustrating how multiple transmitters and receivers can be paired and expanded across different rooms and doors.
Video: Demonstrates how to change the volume and melody settings on the wireless doorbell receiver.
Maintenance
1. Battery Replacement
The transmitter uses a 12V 23A alkaline battery, which typically lasts 1 to 3 years. When the transmitter's LED indicator no longer lights up or the range decreases significantly, it's time to replace the battery.
- Carefully open the back cover of the transmitter using the provided screwdriver or a small flat-head screwdriver.
- Remove the old 12V 23A battery.
- Insert a new 12V 23A alkaline battery, ensuring the correct polarity (+/-).
- Close the back cover securely.

Image: Illustration showing the transmitter and its 12V 23A battery, indicating an ultra-long service life of 1-3 years.
2. Cleaning
Wipe the doorbell units with a soft, dry cloth. Do not use abrasive cleaners or solvents, as these can damage the finish or internal components.
3. Weather Resistance
The transmitter has an IP55 waterproof rating, making it resistant to dust and water splashes. It is designed to withstand outdoor conditions within a temperature range of -30°C to 70°C (-22°F to 158°F). While durable, avoid submerging the transmitter in water.

Image: Visual representation of the transmitter's IP55 dustproof and waterproof rating, showing its resilience in various weather conditions.
Troubleshooting
- No Sound from Receiver:
- Ensure the receiver is properly plugged into a working power outlet.
- Check the volume level; it might be set to mute. Press the volume button to increase the sound.
- Verify that the transmitter battery is not depleted. Replace if necessary.
- Re-pair the transmitter and receiver as described in the "Operating Instructions" section.
- Short Wireless Range:
- Obstacles such as thick walls, metal structures, or other electronic devices can interfere with the signal. Try relocating the receiver or transmitter.
- Ensure the transmitter battery is not low.
- Transmitter Not Working:
- Replace the 12V 23A battery in the transmitter.
- Ensure the transmitter is within the operating temperature range.
Specifications
| Model Number | N82K |
| Wireless Range | Up to 1300 ft (400 m) in open areas |
| Melodies | 55 selectable chimes |
| Volume Levels | 5 levels (0-110 dB), including mute mode |
| Waterproof Rating (Transmitter) | IP55 |
| Operating Temperature | -30°C to 70°C (-22°F to 158°F) |
| Transmitter Battery | 1 x 12V 23A Alkaline Battery (included) |
| Receiver Power Source | AC 120V (Plug-in) |
| Transmitter Dimensions | 8.6 x 3.5 x 1.37 cm (3.38 x 1.37 x 0.54 inches) |
| Receiver Dimensions | 7 x 7 x 3.7 cm (2.75 x 2.75 x 1.46 inches) |
| Material | ABS |

Image: Diagram showing the compact dimensions of both the transmitter and the plug-in receiver.

Image: Illustration depicting the ultra-long wireless range coverage of 1300 feet (400 meters) for the doorbell system.
Warranty Information
Specific warranty details for your SURFOU Wireless Doorbell N82K are typically provided with your product packaging or can be found on the official SURFOU website. Please refer to these resources for information regarding warranty duration, coverage, and claims procedures.
Customer Support
If you encounter any issues or have questions not covered in this manual, please contact SURFOU customer support. Contact information can usually be found on the product packaging, the SURFOU brand store on Amazon, or their official website.