1. Introduction
This manual provides detailed instructions for the setup, operation, and maintenance of your Chatthen WiFi Pager Caregiver Alert System, Model CHAF876. This system is designed to provide peace of mind for caregivers and independence for individuals requiring assistance, such as seniors, patients, or those with limited mobility. It features a WiFi-enabled receiver, an SOS panic button, and a watch pager, all compatible with the Tuya Smart/Smart Life mobile application for remote monitoring and notifications.

Figure 1: Chatthen WiFi Pager Caregiver Alert System components.
2. Product Overview
2.1. Package Contents
- 1 x WiFi Pager Receiver
- 1 x SOS Panic Button (with lanyard)
- 1 x Watch Pager
- 1 x USB Power Cable (for receiver)
- Batteries (CR2032 for SOS button, 27A 12V for Watch Pager)
- Instruction Manual
2.2. Key Features
- Multi-functional Pager: The receiver offers 5 ringtones, adjustable volume, alarm duration, and brightness. It can pair with up to 200 call buttons.
- Easy to Use: Simple pairing process between transmitters and receiver.
- APP Remote Monitoring: Receive alarm notifications on your mobile phone via the Tuya Smart/Smart Life APP, regardless of your location.
- Wireless Range: The transmitter and receiver have an operational range of up to 230 feet (70 meters) indoors. Not suitable for outdoor use.
- Versatile Application: Suitable for homes, hospitals, and nursing homes, providing privacy and independence for users while offering peace of mind for caregivers.

Figure 2: Flexible placement and wearing options for the call buttons.
3. Setup Instructions
3.1. Power On the Receiver
- Connect the provided USB power cable to the receiver.
- Plug the USB cable into a suitable power adapter (not included) and then into a wall outlet.
- The receiver will power on, and the LED indicator will light up.
Video 1: How to set up the Chatthen WiFi Pager system, including power-on, pairing, and app connection.
3.2. Pairing Wireless Buttons
The SOS Panic Button and Watch Pager need to be paired with the receiver. Follow these steps:
- Ensure the receiver is powered on.
- Press the 'Set' key on the back of the receiver. The receiver will emit a "DiDi" sound, indicating it's in pairing mode.
- Press the SOS button on the panic button or watch pager. The receiver will stop sounding, confirming successful pairing.
- Repeat for any additional buttons.
3.3. Connecting to Mobile App (Tuya Smart/Smart Life)
The receiver connects to your home WiFi network to send notifications to your smartphone. Important: The system only supports 2.4GHz WiFi networks. Ensure your phone is connected to a 2.4GHz network during setup.
- Download and install the "Tuya Smart" or "Smart Life" app from your smartphone's app store.
- Register or log in to your account.
- In the app, tap "Add Device" or the "+" icon.
- Long press the 'Set' key on the back of the receiver for 6 seconds until the LED light on the receiver starts flashing continuously. This indicates pairing mode.
- In the app, select the appropriate device type (e.g., "Socket" or "Other" under Electrical, then look for a WiFi-enabled device). The app may automatically discover the device.
- Enter your 2.4GHz WiFi network name and password when prompted.
- Follow the on-screen instructions to complete the connection. Once connected, the LED on the receiver will stop flashing and remain solid green.

Figure 3: Receiver powered via USB cable.
4. Operating Instructions
4.1. Triggering an Alert
When assistance is needed, simply press the SOS button on the panic button or watch pager. A signal will be sent to the receiver and, if connected, to your mobile app.
4.2. Receiving Alerts
- Receiver: The receiver will sound an alarm and display "SOS" on its screen.
- Mobile App: Your smartphone will receive an immediate alarm notification, even if you are away from home.

Figure 4: Real-time app notifications and system response during an alert.
4.3. App Functions and Settings
The Tuya Smart/Smart Life app allows you to customize various settings:
- Volume Adjustment: Adjust the alarm volume of the receiver.
- Ringtone Selection: Choose from 5 available ringtones.
- Alarm Duration: Set how long the alarm sounds.
- Brightness Adjustment: Control the brightness of the receiver's display.
- Remote Monitoring: View alarm history and manage devices from anywhere.
- Share Device: Share access to the device with family members.


Figure 5: Examples of app settings and alarm interface.
5. Maintenance
5.1. Battery Replacement
- SOS Panic Button: Uses a CR2032 battery. Replace when the button's LED indicator does not light up or the signal becomes unreliable.
- Watch Pager: Uses a 27A 12V battery. Replace when the watch pager's LED indicator does not light up or the signal becomes unreliable.
To replace batteries, carefully open the device casing, remove the old battery, and insert the new one with the correct polarity. Close the casing securely.
5.2. Cleaning
Wipe the receiver and buttons with a soft, dry cloth. Do not use liquid cleaners or abrasive materials, as this may damage the device.
6. Troubleshooting
- No alarm from receiver or app notification:
- Ensure the receiver is properly powered on and the LED indicator is solid green.
- Check if the wireless buttons are paired correctly (refer to Section 3.2).
- Verify the receiver is connected to a 2.4GHz WiFi network (refer to Section 3.3).
- Confirm your smartphone has an active internet connection and app notifications are enabled.
- Check the batteries in the SOS button and watch pager. Replace if necessary.
- App not connecting to receiver:
- Ensure your WiFi network is 2.4GHz. The system does not support 5GHz WiFi.
- Make sure your phone is connected to the same 2.4GHz WiFi network during the setup process.
- Restart the receiver by unplugging and re-plugging it.
- Try resetting the receiver to factory settings (consult manufacturer support if needed, as this is not explicitly detailed in the provided data).
- Short wireless range:
- The maximum indoor range is 230 feet (70 meters). Walls and other obstructions can reduce this range.
- Ensure the receiver is centrally located within the desired coverage area.
- Avoid placing the receiver near large metal objects or other electronic devices that may cause interference.
7. Specifications
| Feature | Specification |
|---|---|
| Brand | Chatthen |
| Model Number | CHAF876 |
| Power Source (Receiver) | USB (5 Volts) |
| SOS Button Battery | CR2032 (included) |
| Watch Pager Battery | 27A 12V (included) |
| Control Method | Touch (buttons) |
| Mounting Type | Wall Mount (receiver) |
| Maximum Wireless Range | 230 Feet (70 meters) |
| Compatible Devices | Smartphone (Tuya Smart/Smart Life APP) |
| WiFi Support | IEEE 802.11 b/g/n 2.4G (5G not supported) |
| Receiver Dimensions | 3.35"L x 3.35"W x 0.91"H |
| Item Weight | 6.7 ounces |
8. Warranty and Support
For warranty information and technical support, please refer to the documentation included with your product or contact Chatthen customer service directly. Details for contacting support are typically available on the product packaging or the manufacturer's official website.