1. Introduction
Thank you for choosing the SECRUI Wireless Doorbell System. This system is designed to provide a reliable and convenient way to be alerted to visitors at your door. Featuring a long wireless range, multiple chime options, and a durable, weather-resistant design, this doorbell is suitable for various home and office environments. This manual provides detailed instructions for setup, operation, and maintenance to ensure optimal performance of your device.
2. Package Contents
Please verify that all components are present in your package:
- 1 × Transmitter (Push Button, battery included)
- 2 × Plug-in Receiver
- 1 × Adhesive Tape
- 2 × Screws
- 2 × Anchors
- 1 × User Manual

Image: The complete SECRUI Wireless Doorbell System, including two plug-in receivers and one push button transmitter.
3. Safety Information
Please read and adhere to the following safety guidelines:
- Always follow the manufacturer's advice when using power tools and wear suitable protective equipment (e.g., safety goggles) when drilling holes, etc.
- Before drilling holes in walls, check for hidden electricity cables and water pipes. The use of a cable/pipe locator is advisable if in doubt.
- The receiver operates on 120 volts AC. Ensure proper electrical safety precautions are taken.
4. Setup and Installation
The SECRUI wireless doorbell system is designed for easy installation and comes pre-paired from the factory. No complex wiring or electrician is required.
4.1. Receiver Installation
Simply plug the receiver into any standard electrical outlet within your desired listening range. Ensure the outlet is easily accessible and not obstructed.

Image: A SECRUI receiver plugged into a wall outlet, illustrating its compact design and key features.
4.2. Transmitter (Push Button) Installation
The push button can be installed using either the included adhesive tape or screws.
Using Adhesive Tape:
- Clean the desired installation surface thoroughly to ensure it is dry and free of dust or grease.
- Peel off one side of the protective film from the adhesive tape and firmly attach it to the back of the transmitter.
- Peel off the other side of the protective film and press the transmitter firmly onto the cleaned surface for at least 30 seconds.
Using Screws:
- Open the back cover of the transmitter.
- Mark the desired drilling points on the wall using the screw holes on the back cover as a guide.
- Drill holes and insert the provided anchors if installing on drywall or masonry.
- Secure the back cover to the wall using the screws.
- Snap the transmitter onto the secured back cover.

Image: Visual guide for installing the push button using either adhesive tape or screws.
For optimal wireless performance, ensure the push button is installed within the 1000ft coverage range of the receiver. Obstacles like thick walls can reduce the effective range.

Image: Illustration of the doorbell's extensive range, allowing placement of receivers in various parts of a home.
5. Operation
5.1. Changing Chimes
The receiver offers 58 different chimes. To cycle through the chimes, press the music note button (♫) on the side of the receiver. The receiver will play the next chime in sequence. The system features a memory function, so your last selected chime will be remembered even after a power outage.
5.2. Adjusting Volume
There are 5 adjustable volume levels. To change the volume, press the volume button (🔊) on the side of the receiver. Each press will cycle through the volume levels from loudest to mute. The 110dB maximum sound level ensures you won't miss a visitor.

Image: Illustration of the doorbell's loud alert sound, capable of reaching 110dB.
5.3. LED Flash and Mute Mode
In addition to the audible chime, the receiver features a colorful LED flash that activates when the push button is pressed. This provides a visual alert, which is particularly useful in noisy environments or for individuals with hearing impairments. When the receiver is set to mute mode (volume level 0), only the LED flash will activate, providing a silent notification.

Image: The LED flash and mute mode feature, ideal for quiet environments like a baby's room.
6. Maintenance
6.1. Cleaning
Wipe the doorbell units with a soft, dry cloth. Do not use abrasive cleaners or solvents, as they may damage the surface.
6.2. Battery Replacement (Transmitter)
The transmitter (push button) is powered by a CR2032 lithium manganese dioxide battery, which has an average life of approximately 3 years. When the push button no longer activates the receiver, it may be time to replace the battery.
- Carefully open the back cover of the transmitter.
- Remove the old CR2032 battery.
- Insert a new CR2032 battery with the positive (+) side facing up.
- Close the back cover securely.

Image: Illustration of the CR2032 battery and its placement within the transmitter for long battery life.
6.3. Weather Resistance
The push button transmitter is IP55 waterproof and dust-proof, designed to withstand various weather conditions. It can operate in temperatures ranging from -4 °F to 140 °F (-20 °C to 60 °C).

Image: The doorbell push button's weather resistance, suitable for extreme temperatures and wet conditions.
7. Troubleshooting
If you encounter issues with your SECRUI Wireless Doorbell System, please refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Receiver does not chime when button is pressed. | 1. Receiver unplugged or no power. 2. Receiver is in mute mode. 3. Transmitter battery is low or dead. 4. Out of range or signal interference. | 1. Ensure receiver is securely plugged into a live outlet. 2. Press the volume button on the receiver to increase volume. 3. Replace the CR2032 battery in the transmitter. 4. Move receiver closer to the transmitter; avoid placing near large metal objects or strong electromagnetic fields. |
| Chime sound is distorted or intermittent. | 1. Weak signal due to distance or obstacles. 2. Interference from other wireless devices. | 1. Relocate receiver or transmitter to reduce distance or clear obstructions. 2. Ensure no other wireless devices are operating on similar frequencies nearby. The system uses FM signaling protocol for robust anti-interference. |
| LED flash does not light up. | 1. Receiver unplugged or no power. 2. Faulty LED. | 1. Ensure receiver is plugged in. 2. If the chime works but LED does not, contact customer support. |
If the problem persists after trying these solutions, please contact SECRUI customer support for further assistance.
8. Specifications
| Feature | Specification |
|---|---|
| Manufacturer | SECRUI |
| Model Number | M508+F55 |
| Item Weight | 6.4 ounces |
| Product Dimensions | 77.17 x 26.77 x 3.94 inches |
| Color | Black |
| Material | ABS |
| Power Source | AC & Battery |
| Voltage | 120 Volts (AC) |
| Installation Method | Self-adhesive tape or anchors/screw (included) |
| Temperature Range | -4 to 140 Degrees Fahrenheit (-20 to 60 °C) |
| Sound Level | Up to 110 dB |
| Type of Bulb | LED |
| Accessory Connection Type | Wireless |
| Plug Format | A- US style |
| Special Features | Adjustable Volume, Optional Ringtone, Memory Function, LED Indicator |
| Usage | Wireless Doorbell / Classroom Doorbell |
| Transmitter Battery Type | 1 CR2032 (included) |
| Average Battery Life | 3 years |

Image: Compact size and dimensions of the receiver and push button, showing the receiver won't block other sockets.
9. Warranty and Support
SECRUI is committed to providing high-quality products. While specific warranty details are not provided in this manual, if you encounter any issues with your doorbell system, please do not hesitate to contact SECRUI customer support immediately. Our team is ready to assist you with any problems or questions you may have.
For more information and support, you may visit the official SECRUI store: SECRUI Store on Amazon.





