1. Introduction
This manual provides comprehensive instructions for the setup, operation, and maintenance of your Coolfire 1685E Vibrating Wristband Alarm Clock. Please read this manual thoroughly before using the device to ensure proper function and longevity.
The Coolfire 1685E is designed to provide a silent, vibrating alarm experience, ideal for individuals who need to wake without disturbing others, heavy sleepers, or those with hearing impairments. It features multiple alarm settings, a stopwatch, and a comfortable wristband.
2. Safety Information
- This device is not water resistant. Avoid contact with liquids.
- Do not attempt to disassemble or repair the device yourself. Refer to qualified service personnel.
- Keep out of reach of small children.
- Use only the provided USB cable for charging.
3. Package Contents
Please verify that all items are present in your package:
- Coolfire 1685E Alarm Unit
- Washable Sweatband (Black)
- USB Charging Cable
- User Manual (this document)
4. Product Overview
The Coolfire 1685E consists of a digital alarm unit and a soft, comfortable sweatband. The alarm unit features a digital display and three control buttons.

Figure 4.1: Coolfire 1685E Vibrating Wristband Alarm Clock. The white alarm unit is embedded in a black sweatband, displaying the time and control buttons.
Control Buttons:
- LIGHT/STW: Activates backlight; functions as Stopwatch control.
- SET: Enters setting mode and confirms selections.
- TIME/ALARM: Toggles between time and alarm display; adjusts values during setting.
5. Setup
5.1 Charging the Device
Before first use, fully charge the alarm unit. A full charge takes approximately 4 hours and provides 4-6 weeks of operation depending on usage.
- Locate the charging port on the back of the alarm unit.
- Connect the provided USB charging cable to the alarm unit.
- Plug the other end of the USB cable into any standard USB power adapter (not included).
- The battery indicator on the display will show charging status. Once fully charged, disconnect the cable.

Figure 5.1: Charging the alarm unit. The image shows the USB cable connected to the charging port on the back of the alarm unit, which is inserted into the sweatband.
5.2 Attaching the Alarm Unit to the Sweatband
The alarm unit is designed to be removable for charging and cleaning of the sweatband.
- Ensure the sweatband is clean and dry.
- Locate the opening in the sweatband designed for the alarm unit.
- Gently push the alarm unit into the opening until it is securely seated. Ensure the display faces outwards.
5.3 Wearing the Wristband
Wear the wristband on your wrist for optimal vibration sensation. The sweatband is designed for comfort during sleep.

Figure 5.2: Wearing the wristband. The image illustrates the alarm unit worn on a wrist, with a separate graphic indicating the sweatband's circumference range of 6.7 inches (170mm) to 8.5 inches (215mm).
6. Operating Instructions
6.1 Setting Time and Date
The device allows setting of the current time and date. Refer to the specific instructions provided on the small printed sheet included with your product for detailed button press sequences, as these can be intricate.
6.2 Setting Alarms
The Coolfire 1685E supports up to 6 distinct vibration alarms. Each alarm can be set independently.
- Press the SET button repeatedly until the alarm setting mode is displayed (e.g., AL1, AL2).
- Use the TIME/ALARM button to adjust the hour and minute values.
- Press SET to confirm each segment (hour, minute) and move to the next alarm or exit setting mode.
- Ensure the alarm is activated (an alarm icon should be visible on the display).

Figure 6.1: Key features of the alarm unit, including the ability to set up to 6 vibration alarms and display alarm times.
6.3 Using the Stopwatch
The device includes a 24-hour precision 1/100 seconds digital stopwatch function.
- Press the LIGHT/STW button to enter stopwatch mode.
- Press LIGHT/STW again to start and stop the stopwatch.
- Press SET to reset the stopwatch.
6.4 Backlight Function
Press the LIGHT/STW button briefly to activate the display backlight for improved visibility in low light conditions.
7. Maintenance
7.1 Cleaning the Sweatband
The sweatband is washable, but the alarm unit is not. Always detach the alarm unit before washing the sweatband.
- To detach the watch, release the locking ring from the back of the watch unit.
- Gently push the watch unit out of the sweatband.
- Wash the sweatband by hand with mild soap and water, or machine wash on a gentle cycle.
- Allow the sweatband to air dry completely before reinserting the alarm unit.

Figure 7.1: Detaching the alarm unit for sweatband washing. The image shows the alarm unit being removed from the sweatband by releasing a locking ring.
7.2 Battery Care
The device is powered by a rechargeable lithium battery. To prolong battery life:
- Charge the device fully when the battery indicator is low.
- Avoid extreme temperatures.
- If storing for an extended period, charge the device to approximately 50% every few months.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not turn on or respond. | Low battery. | Charge the device for at least 4 hours. |
| Alarm does not vibrate. | Alarm not activated or set incorrectly. | Verify alarm settings and ensure the alarm icon is visible on the display. Check battery level. |
| Difficulty setting time/alarm. | Incorrect button sequence. | Refer to the detailed instructions provided on the small printed sheet included with your product. Practice the button sequences. |
| Short battery life. | Frequent alarm use or backlight activation. | Battery life varies with usage. Ensure full charge. Reduce frequency of backlight use if possible. |
9. Specifications
- Brand: Coolfire
- Model: 1685E
- Display Type: Digital
- Power Source: Battery Powered (1 Lithium Polymer battery required)
- Charging Time: Approximately 4 hours
- Operating Time: 4-6 weeks per full charge (typical)
- Special Features: 6 Vibration Alarms, Stopwatch, Backlight
- Material: Plastic (alarm unit), Cotton (sweatband)
- Item Weight: 1.6 ounces
- Product Dimensions: 3.5"W x 3.5"H (alarm unit)
- Wristband Size: 6.7" (170mm) to 8.5" (215mm) circumference
- UPC: 841321108071
10. Warranty and Support
For warranty information or technical support, please refer to the contact details provided with your purchase documentation or visit the official Coolfire website. Keep your proof of purchase for any warranty claims.



