Introduction
Thank you for choosing the SURFOU Wireless Doorbell Kit N128. This kit provides a reliable and convenient solution for your home or office, ensuring you never miss a visitor. Featuring an extended wireless range, weather-resistant design, and customizable melodies and volume levels, this doorbell is designed for optimal performance and user comfort. This manual will guide you through the installation, operation, and maintenance of your new doorbell.
Package Contents
Please ensure all items are present in your package:
- 1 x Wireless Doorbell Transmitter (Push Button)
- 1 x Plug-in Doorbell Receiver (Chime Unit)
- Mounting Hardware (Screws, Anchors, Adhesive Tape)
- User Manual

This image displays the SURFOU Wireless Doorbell Kit, featuring the sleek, dark grey transmitter button and the matching plug-in receiver unit. Both components are designed for modern home aesthetics.
Setup and Installation
Follow these steps to set up your SURFOU Wireless Doorbell Kit:
1. Install the Transmitter (Push Button)
- Choose a Location: Select a suitable location near your door. Ensure the surface is clean and dry.
- Mounting Options:
- Adhesive Tape: Peel off one side of the double-sided adhesive tape and stick it to the back of the transmitter. Peel off the other side and firmly press the transmitter onto the desired surface for at least 30 seconds.
- Screws: Use the provided screws and anchors to securely mount the transmitter to the wall. Mark the drill points, drill holes, insert anchors, and then screw the transmitter into place.
2. Install the Receiver (Chime Unit)
- Plug In: Insert the receiver into any standard electrical outlet within the wireless range of the transmitter.
- Placement: For optimal performance, place the receiver in a central location where the chime can be heard throughout your home or office.

This image demonstrates the impressive 400-meter wireless range of the SURFOU doorbell. The transmitter is shown outside a modern house, and the receiver is depicted inside, indicating reliable signal transmission across a large area, ensuring you never miss a visitor.
Operating Instructions
Your SURFOU Wireless Doorbell Kit offers several customizable features:
1. Changing Melodies
- Press the Ringtone Selection Button on the side of the receiver to cycle through the 55 available melodies.
- The receiver will play a preview of each melody as you press the button.
- Your last selected melody will be saved automatically.
2. Adjusting Volume
- Press the Volume Control Button on the side of the receiver to adjust the volume level.
- There are 5 volume levels, ranging up to 110 dB.
- The lowest setting is a mute mode (LED only).
3. Operating Modes (LED Indicator)
- The receiver features an LED indicator that flashes when the doorbell is pressed.
- This visual notification is particularly useful for individuals with hearing impairments or in noisy environments.
- You can choose between LED only mode (mute) or LED + sound mode.

This image displays the SURFOU doorbell receiver and transmitter, highlighting key customizable features. It indicates a selection of 55 distinct melodies, 5 adjustable volume levels, and 2 operating modes (sound + LED, or LED only), allowing users to personalize their doorbell experience.

This image illustrates the accessibility features of the SURFOU doorbell receiver. It shows the flashing LED light, which provides a visual alert, making it helpful for individuals with hearing impairments. The image also depicts the mute mode and a range of sound levels from 0 dB to 110 dB, catering to different preferences and needs.
Maintenance
To ensure the longevity and optimal performance of your SURFOU Wireless Doorbell Kit, consider the following:
- Cleaning: Wipe the transmitter and receiver with a soft, dry cloth. Avoid using harsh chemicals or abrasive cleaners.
- Battery Replacement (Transmitter): The transmitter is designed for a long battery life of 1-3 years. When the battery is low, the signal strength may decrease. Replace the battery as needed (battery type not specified in provided data, typically a 12V 23A or CR2032 coin cell).
- Weather Resistance: The transmitter is dustproof and waterproof, designed to withstand temperatures from -30°C to 70°C (-22°F to 158°F). While robust, avoid submerging it in water or exposing it to extreme conditions unnecessarily.

This image emphasizes the durability of the SURFOU doorbell transmitter, showcasing its dustproof and waterproof design in a challenging weather environment. It highlights an operating temperature range of -30°C to 70°C (-22°F to 158°F) and a battery lifespan of 1-3 years, ensuring reliable performance in various climates.
Troubleshooting
If you encounter any issues with your doorbell, please refer to the following common solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Doorbell does not chime | Receiver unplugged or power outage. Transmitter battery low or dead. Out of range. | Ensure receiver is plugged in and powered. Replace transmitter battery. Move receiver closer to transmitter. |
| Short wireless range | Obstructions (thick walls, metal structures). Interference from other wireless devices. | Relocate receiver or transmitter to minimize obstructions. Avoid placing near large metal objects or other wireless devices. |
| Chime is too quiet or too loud | Volume setting is incorrect. | Press the Volume Control Button on the receiver to adjust to the desired level. |
| Doorbell chimes randomly | Interference from other devices. Faulty transmitter. | Try re-pairing the transmitter and receiver (if applicable, refer to specific pairing instructions if provided with product). Contact customer support if issue persists. |
Specifications
Key technical details for the SURFOU Wireless Doorbell Kit N128:
- Model Number: N128
- Wireless Range: Up to 400 meters (open area)
- Melodies: 55 selectable chimes
- Volume Levels: 5 adjustable levels (up to 110 dB)
- Operating Modes: Sound + LED, LED only
- Operating Temperature: -30°C to 70°C (-22°F to 158°F)
- Weather Resistance: Dustproof and Waterproof (Transmitter)
- Transmitter Power: Battery-powered (1-3 years lifespan)
- Receiver Power: AC Plug-in
- Product Dimensions (L x W x H): Approximately 7 x 7 x 6.5 cm (Receiver); 8.6 x 3.5 cm (Transmitter)
- Weight: Approximately 92.2 grams
- Country of Origin: China

This detailed diagram provides an overview of the SURFOU doorbell components, including their dimensions. It labels the buttons on the receiver for ringtone selection, volume control, and the 'next' button, as well as the LED display. The transmitter button is also clearly shown, indicating its function as the doorbell button.
Customer Support
SURFOU is committed to providing exceptional customer service. If you have any questions, concerns, or require assistance with your Wireless Doorbell Kit N128, please do not hesitate to contact our support team. Our customer service is available 24/7 to ensure a worry-free user experience.
For support, please refer to the contact information provided with your product packaging or visit the official SURFOU website.