1. Setup and Installation
1.1 Package Contents
Before you begin, please ensure all items are present in your package:
- 4 Plug-in Receivers
- 3 Battery-Powered Buttons (batteries included)
- 3 Door Plates
- 6 Screws
- 1 Mini Screwdriver
- 4 Double-Sided Adhesive Stickers
- 1 English Instruction Manual
1.2 Installation Steps
The SURFOU Wireless Doorbell is designed for quick and easy installation. Follow these steps:
- Prepare the Receiver: Plug the receiver into a standard electrical socket in your desired location.
- Prepare the Button: Unplug the plastic sheet from the battery compartment of the button to activate the battery.
- Mount the Button: Choose one of the following methods to fix the button to the wall near your door:
- Using Double-Sided Tape: Peel off the protective film from one side of a double-sided adhesive sticker and apply it to the back of the doorbell button. Peel off the other side and firmly press the button onto a clean, dry surface on your wall.
- Using Screws: Open the doorbell button casing (use the mini screwdriver if necessary, though some models may not require it for initial battery activation). Mark the screw holes on the wall, drill pilot holes, insert wall anchors (if needed), and secure the button with the provided screws. Reassemble the casing.
- Test the System: Press the doorbell button to ensure the receiver rings and the LED flashes.

The doorbell system is designed for simple and convenient installation.

The doorbell offers an ultra-long wireless range of up to 1300 feet (400 meters), ensuring coverage throughout your home.
2. Operation
2.1 Pairing and Expansion
Your SURFOU Wireless Doorbell system supports multiple learning codes and offers unlimited expansion. This allows you to pair additional transmitters (buttons) and receivers to customize your system.
- Adding More Units: To pair new transmitters or receivers, consult the detailed pairing instructions in the included English instruction manual.
- Custom Chimes: You can pair different chimes with different buttons, allowing you to identify which door has been triggered.

The system supports unlimited expansion, allowing multiple buttons and receivers across various locations.
2.2 Chime and Volume Settings
The receiver offers 55 classic ringtones and 5 adjustable volume levels (0-110dB), including a mute option.
- Changing Chime: Press the 'Chime Selection' button on the receiver to cycle through the available melodies.
- Adjusting Volume: Press the 'Volume Control' button on the receiver to adjust the volume level.
- Memory Function: The system retains your last selected chime and volume settings even after being unplugged and reinserted.

Choose from 55 chimes and 5 adjustable volume levels to suit your environment.

A selection of 55 ringtones is available for personalization.
2.3 LED Indicator
The receiver features an LED indicator that flashes when the doorbell button is pressed. This visual alert is particularly useful for individuals with hearing impairments or in noisy environments.
3. Maintenance
3.1 Weather Resistance
The doorbell button is IP55 dustproof and waterproof, designed to withstand various weather conditions, including snow, sun, and rain. Its operating temperature range is -22°F to 158°F (-30°C to 70°C).

The IP55 rated button is built to endure diverse weather conditions.
3.2 Battery Replacement
The doorbell button is powered by a 12V 23A alkaline battery, offering extremely low power consumption and a service life of up to 3 years. When the battery needs replacement, carefully open the button casing using the mini screwdriver (if applicable) and replace the old battery with a new 12V 23A battery, ensuring correct polarity.

The doorbell button uses a 12V 23A battery with a long lifespan.
4. Troubleshooting
If you encounter issues with your SURFOU Wireless Doorbell, please refer to the following common troubleshooting tips:
- No Sound from Receiver:
- Ensure the receiver is properly plugged into a working power outlet.
- Check the volume setting; it might be muted or set too low.
- Verify the doorbell button battery is active (plastic sheet removed) and not depleted. Replace if necessary.
- Re-pair the button and receiver according to the pairing instructions in the full manual.
- Short Operating Range:
- Ensure there are no large metal objects or thick walls directly between the button and receiver that could obstruct the signal.
- Relocate the receiver or button to a more central position to improve signal strength.
- Avoid placing the receiver near other electronic devices that may cause interference.
- Button Not Responding:
- Check the battery in the doorbell button. Replace it if it's old or depleted.
- Ensure the button is within the operating range of the receiver.
- Re-pair the button with the receiver.
- Interference from Other Devices:
- The system has strong anti-interference capabilities. However, if you experience interference, try changing the chime melody or relocating the receiver slightly.
5. Specifications
Key technical specifications for the SURFOU Wireless Doorbell Model N128:
| Feature | Specification |
|---|---|
| Model Number | N128 |
| Wireless Range | Up to 1300 feet (400 meters) |
| Chime Options | 55 melodies |
| Volume Levels | 5 levels (0-110dB) |
| Waterproof Rating (Button) | IP55 |
| Operating Temperature | -22°F to 158°F (-30°C to 70°C) |
| Button Battery Type | 12V 23A Alkaline |
| Receiver Power | AC100-260V/50-60Hz (Plug-in) |
| Item Weight | 15.2 ounces (total package) |
| Product Dimensions (Receiver) | 2.8 x 1.7 x 2.8 inches |
| Product Dimensions (Button) | 3.4 x 1.4 inches (approx. 8.6 x 3.5 cm) |

Dimensions of the compact wireless doorbell receiver and button.
6. Warranty Information
SURFOU products are manufactured to high-quality standards. This product is covered by a standard manufacturer's warranty against defects in materials and workmanship from the date of purchase. Please retain your proof of purchase for warranty claims. The warranty does not cover damage caused by misuse, accident, unauthorized modification, or normal wear and tear.
7. Customer Support
For any questions, concerns, or assistance with your SURFOU Wireless Doorbell, please do not hesitate to contact our customer support team. We are committed to providing excellent after-sales service and will respond to your inquiries within 24 hours.
Please refer to the contact information provided in your product packaging or visit the official SURFOU website for support details.




