Introduction
Thank you for choosing the KERUI M558 Wireless Doorbell. This device is designed to provide a convenient and reliable alert system for your home or office. It features a strong wireless signal, multiple ringtone options, and adjustable volume levels to suit your preferences. Please read this manual carefully before installation and use to ensure optimal performance and safety.

Setup Instructions
Follow these steps to set up your KERUI M558 Wireless Doorbell:
- Unboxing and Component Check:
- Identify the doorbell receiver(s) and push button(s) based on your purchased package (e.g., 1 receiver + 1 button, 1 receiver + 2 buttons, 2 receivers + 1 button).
- Ensure all components are present and undamaged.

Various package configurations of the doorbell system and their typical placements in different environments. - Receiver Installation:
- The doorbell receiver operates on 220V AC power. Simply plug the receiver into a standard wall outlet in your desired location.
- Choose a central location within your home to ensure the best signal reception from the push button.

Illustration of the doorbell receiver being plugged into a 220V AC outlet and the push button being affixed with double-sided tape. - Push Button Installation:
- The push button comes with a built-in battery and is designed for easy installation using double-sided tape.
- Clean the surface where you intend to mount the button to ensure good adhesion.
- Peel off the protective film from the double-sided tape on the back of the button and firmly press it onto the desired surface (e.g., door frame, wall).
- Pairing (if necessary):
- Most units are pre-paired from the factory. If your doorbell does not ring after installation, you may need to pair the button with the receiver.
- Refer to the detailed user manual (PDF link below) for specific pairing instructions, as this process can vary slightly.
Operating Instructions
The KERUI M558 Wireless Doorbell is designed for simple operation:
- Triggering the Doorbell: Press the push button located outside your door. The receiver will chime according to your selected settings.
- Changing Ringtones: The receiver offers 33 optional songs. Look for a 'Music' or 'Tune' button on the side of the receiver. Press this button repeatedly to cycle through the available melodies until you find your preferred one.
- Adjusting Volume: The receiver has 4 levels of adjustable volume. Locate the 'Volume' button on the side of the receiver. Press this button to increase or decrease the volume to your desired level.

Maintenance
To ensure the longevity and proper functioning of your doorbell:
- Cleaning: Wipe the receiver and push button with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Push Button Battery: The push button has a built-in battery. While designed for long life, if the button stops working or its range significantly decreases, the battery may need replacement. Consult the full user manual for instructions on accessing and replacing the battery, if applicable.
- Environmental Considerations: Avoid exposing the push button to extreme weather conditions or direct prolonged sunlight, which can affect battery life and material integrity.
Troubleshooting
If you encounter issues with your KERUI M558 Wireless Doorbell, try the following solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Doorbell does not ring | Receiver unplugged or power outage Push button battery low/dead Out of range Not paired | Ensure receiver is plugged in and powered Replace push button battery (if applicable) Move receiver closer to button Re-pair button and receiver (see full manual) |
| Short transmission range | Obstructions (thick walls, metal objects) Interference from other wireless devices Low battery in push button | Relocate receiver or button to minimize obstructions Move away from other wireless devices Replace push button battery (if applicable) |
| Volume too low/high | Volume setting incorrect | Press the 'Volume' button on the receiver to adjust |
| Cannot change ringtone | Incorrect button pressed | Press the 'Music' or 'Tune' button on the receiver to cycle through songs |
Specifications
- Model: M558
- Brand: KERUI
- Item Type: Wireless Doorbell / Welcome Chime
- Connection Type: Wireless
- Power Supply (Receiver): Electric Supply (220V AC, Plug and Play)
- Power Supply (Push Button): Built-in Battery
- Ringtones: 33 selectable songs
- Volume Levels: 4 adjustable levels
- Transmission Range: Up to 150 meters (500 feet) in open space
- Certification: CE, FCC Part 15 Compliant

For more detailed technical specifications, please refer to the official user manual PDF: View User Manual (PDF)
User Tips
- Optimal Placement: For best wireless performance, try to place the receiver and push button where there are minimal obstructions like thick concrete walls or large metal objects.
- Testing Range: After installation, test the doorbell from various distances and locations around your property to ensure reliable signal transmission.
- Multiple Receivers: If you have a larger home or multiple floors, consider using multiple receivers to ensure the chime is audible throughout your property.
Warranty and Support
For any questions, technical support, or warranty claims, please contact the seller or manufacturer directly. Keep your purchase receipt as proof of purchase. Additional information and detailed instructions can be found in the comprehensive user manual available as a PDF document.
Official User Manual (PDF): Download PDF