1. Introduction
The Retekess T128 Wireless Calling System Watch Receiver is designed to enhance service efficiency in various environments such as restaurants, pubs, and cafes. This rechargeable and waterproof watch receiver works seamlessly with compatible call buttons like the T117 and T114, providing timely notifications to staff. Its simple operation and robust features ensure a smooth communication flow between customers and service personnel.
2. Package Contents
Before proceeding with setup, please verify that all items listed below are included in your package:
- 1x Retekess T128 Watch Receiver
- 1x USB Adapter
- 1x USB Cable
- 1x User Manual

Figure 2.1: Package contents for the Retekess T128 Wireless Calling System Watch Receiver.
3. Product Overview
3.1. Key Features
- Rechargeable Battery: Equipped with a built-in 400 mAh lithium battery, offering up to 48 hours of standby time on a full charge. Charging takes approximately 2-3 hours via the Micro-USB port.
- Multiple Reminder Modes: Notifies staff through beep, vibration, or flash, adjustable to suit different environmental needs.
- Strong Compatibility: Compatible with Retekess T117 and T114 call buttons, and expandable to pair with up to 500 pagers.
- Long Transmission Distance: Achieves a transmission range of up to 100 meters in open areas, with an indoor range of 40-60 meters, suitable for most restaurant settings.
- Waterproof Design: The watch receiver features a waterproof design for durability in various service environments.
3.2. Battery and Charging
The T128 watch receiver includes a 400mAh rechargeable battery. To charge, connect the provided USB cable to the Micro-USB port on the watch and plug the USB adapter into a power source. A full charge typically takes 2-3 hours and provides 36-48 hours of standby time.

Figure 3.1: T128 Watch Receiver Micro-USB Port and Battery Information.
3.3. Compatibility
The T128 watch receiver is designed for strong compatibility with various Retekess transmitters, including the T117 and T114 call buttons. This allows for flexible system expansion to meet diverse service needs.

Figure 3.2: T128 Watch Receiver Compatibility with Call Buttons.
3.4. Transmission Range
The system offers a long transmission distance, reaching up to 100 meters in open areas. For indoor use, the effective range is typically between 40 to 60 meters, which is sufficient for most restaurant and cafe layouts.

Figure 3.3: Long Transmission Distance Capability.
4. Setup Guide
4.1. Initial Charging
Before first use, fully charge the T128 watch receiver using the provided USB cable and adapter. The device is fully charged when the battery indicator shows full capacity.
4.2. Pairing Call Buttons
To ensure the watch receiver can receive calls, you must pair it with your call buttons (e.g., T117, T114). The pairing process typically involves entering a setup mode on the watch and then activating the call button to register it. Refer to the watch's on-screen menu for 'add caller' or 'pairing' options. You can customize the watch number and button function during this process.

Figure 4.1: Simple Pairing Interface on T128 Watch Receiver.
5. Operating Instructions
5.1. Receiving Calls
When a guest presses a paired call button, the T128 watch receiver will display the call information (e.g., table number) and activate the selected reminder mode.
5.2. Adjusting Reminder Modes
The T128 offers three prompt modes: Beep, Vibration, and Light (Flash). You can select and combine these modes through the watch's settings menu to best suit your working environment and preferences.

Figure 5.1: Three Prompt Modes for Call Notifications.
5.3. Multiple Function Settings
The watch receiver allows for various function settings to manage call records and display behavior. These include:
- Cycle Time: Adjusts how long call notifications are displayed.
- Remove Time: Sets the duration after which a call notification is automatically cleared.
- Prompt Time: Configures the duration of the reminder (beep, vibration, flash).

Figure 5.2: Multiple Function Settings Interface.
6. Maintenance
6.1. Battery Care
To prolong battery life, avoid fully discharging the device frequently. Charge the watch receiver regularly, especially if it will be stored for an extended period. Use only the provided charging cable and adapter.
6.2. Cleaning and Storage
Clean the watch receiver with a soft, damp cloth. Do not use harsh chemicals or abrasive cleaners. Store the device in a cool, dry place away from direct sunlight and extreme temperatures. Although the device has a waterproof design, avoid prolonged submersion in water.
7. Troubleshooting
If you encounter issues with your Retekess T128 watch receiver, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Watch turns off when removed from charger. | Battery not holding charge or faulty battery. | Ensure the device is fully charged. If the issue persists, the battery may need replacement or the device may be faulty. Contact customer support. |
| Call buttons do not trigger notifications. | Buttons not paired, out of range, or low battery in buttons. | Verify that call buttons are correctly paired with the watch receiver. Ensure buttons are within the operational range. Check and replace button batteries if necessary. |
| Battery life is shorter than expected. | Frequent use, old battery, or continuous vibration/flash mode. | Reduce the duration of vibration/flash alerts. Ensure the battery is fully charged. If the device is old, battery degradation is possible. |
| Screen is black or unresponsive. | Device malfunction or critical battery drain. | Attempt to charge the device for several hours. If the screen remains black, the device may be faulty. Contact customer support. |
8. Specifications
| Feature | Detail |
|---|---|
| Model Number | T128 |
| Manufacturer | Retekess |
| Product Dimensions | 4.7 x 4.7 x 1.4 cm; 80 g |
| Battery Type | 1 Lithium Ion battery (included) |
| Battery Capacity | 400 mAh |
| Charging Time | 2-3 hours |
| Standby Time | 36-48 hours |
| Transmission Distance (Open Area) | Up to 100 m |
| Transmission Distance (Indoor) | 40-60 m |
| Expandability | Up to 500 pagers |

Figure 8.1: T128 Watch Receiver Dimensions.
9. Warranty and Support
Retekess products come with a standard manufacturer's warranty. For specific warranty details, please refer to the documentation included with your purchase or visit the official Retekess website. If you require technical assistance, troubleshooting, or have questions about your T128 Wireless Calling System Watch Receiver, please contact Retekess customer support through their official channels.