cofuo CF-1100-B
cofuo Kids Digital Sport Waterproof Watch User Manual
Model: CF-1100-B
Introduction
This manual provides comprehensive instructions for the operation, setup, and maintenance of your new cofuo Kids Digital Sport Waterproof Watch. Please read this manual carefully to ensure proper use and to maximize the lifespan of your watch.
Product Features
- Precise and accurate time keeping with Original Movement.
- Durable PC material case and Stainless Steel case back.
- High-quality Silicone Strap for comfort.
- Highly Transparent Resin Glass, resistant to wear.
- 50M Water Resistant: Suitable for daily use, hand washing, showering, and swimming. (Note: Do not press buttons underwater.)
- Multi-functional: Calendar (Date, Week, Month), Alarm, LED Display, Back Light, Shock Resistant, Stopwatch.
- Colorful LED Backlight: Press the "LIGHT" button to illuminate the display for clear visibility at night.
Package Contents
Upon opening your package, please ensure all items are present:
- 1 x cofuo Children Silicone Band Outdoor Sport Watch
- 1 x User Manual (this document)
Product Overview
Familiarize yourself with the watch's components and button functions:

Image Description: A blue cofuo digital watch with labels pointing to its various parts and functions. The labels indicate: "LIGHT BUTTON" (top left, A), "MODE BUTTON" (bottom left, B), "ALARM" (bottom left icon), "START/STOP BUTTON" (top right, D), "RESET BUTTON" (bottom right, C), "TIME", "SECOND", "WEEK", "Red Cold Backlight", "Alarm", "Stopwatch", "Date And Time", and "12/24 Display".
The watch features four primary buttons, typically referred to as A, B, C, and D, corresponding to Top-Left, Bottom-Left, Bottom-Right, and Top-Right respectively.
- Button A (Top-Left): Controls the backlight color.
- Button B (Bottom-Left): Changes the display mode (Time, Alarm, Stopwatch).
- Button C (Bottom-Right): Used for resetting or adjusting values during setup.
- Button D (Top-Right): Used for starting/stopping functions or incrementing values during setup.
Setup Instructions
Setting Time and Date
- From the normal time display mode, press Button B (Mode) three times. The seconds display will begin to flash, indicating you are in time setting mode.
- Press Button D (Start/Stop) to cycle through the digits you wish to set: seconds, hours, minutes, month, date, and day of the week. The currently selected digit will flash.
- Use Button C (Reset) to adjust the flashing digit. For hours, it will cycle through AM, PM, and 24-hour format.
- Once all desired settings are adjusted, press Button B (Mode) again to exit the setting mode and return to the normal time display.
Setting the Alarm
- From the normal time display mode, press Button B (Mode) once to enter the Alarm setting mode. The alarm time will be displayed.
- Press Button D (Start/Stop) to select the hour or minute digit you wish to set. The selected digit will flash.
- Use Button C (Reset) to adjust the flashing digit to your desired alarm time.
- Press Button B (Mode) to exit the alarm setting mode.
Turning Alarm ON/OFF
- In normal time display mode, press and hold Button C (Reset), then press Button D (Start/Stop).
- An alarm icon (bell symbol) will appear on the display when the alarm is active. If the icon is not visible, the alarm is off.
Turning Hourly Chime ON/OFF
- In normal time display mode, press and hold Button C (Reset), then press Button B (Mode).
- If all days of the week are displayed, the hourly chime is ON. If they are not displayed, the hourly chime is OFF.
Changing Backlight Color
- Press and hold Button A (Light). The backlight color will cycle through available options.
- Release Button A when your desired color is displayed. This color will be set as the default for future backlight activations.

Image Description: A blue cofuo watch demonstrating its colorful LED backlight feature. Seven small circles around it show the watch display in different colors: red, green, blue, light blue, purple, yellow, and pink, illustrating the various backlight options.
Operating Instructions
Using the Stopwatch
- From the normal time display mode, press Button B (Mode) twice to enter the Stopwatch mode. The display will show "00:00:00".
- Press Button D (Start/Stop) to start the stopwatch.
- Press Button D (Start/Stop) again to pause the stopwatch.
- To reset the stopwatch to zero, press Button C (Reset) while the stopwatch is paused.
- Press Button B (Mode) to exit the Stopwatch mode and return to the normal time display.
Activating Backlight
- Simply press Button A (Light) to illuminate the display. The light will stay on for a few seconds.
Water Resistance Guidelines
Your cofuo watch is designed with 50M (5 ATM) water resistance, making it suitable for daily use, hand washing, showering, and swimming. However, to maintain its water resistance and prolong its life, please adhere to the following:
- DO NOT press any buttons while the watch is submerged in water.
- Avoid wearing the watch during prolonged underwater activities such as diving or snorkeling.
- Exposure to extreme hot or cold temperatures (e.g., hot showers, saunas, very cold water) can shorten the watch's lifespan and compromise its water resistance.
- If mist or droplets appear inside the watch surface, contact customer support immediately.

Image Description: A blue cofuo watch partially submerged in clear water, with water splashing around it. Two cartoon fish are visible in the water, and text indicates "30M WATER RESISTANT".
Maintenance
- Clean the watch strap regularly with a soft, damp cloth. Avoid harsh chemicals or abrasive materials.
- Store the watch in a cool, dry place when not in use.
- Avoid exposing the watch to strong magnetic fields, which can affect timekeeping accuracy.
Troubleshooting
Time is Incorrect or Changes Randomly
- Ensure the time and date are set correctly following the "Setting Time and Date" instructions.
- Accidental button presses can sometimes alter settings. Regularly check the time and mode.
- If the issue persists, the battery may be low. Contact customer support for battery replacement information.
Display is Dim or Not Lighting Up
- Ensure the "LIGHT" button (Button A) is pressed firmly.
- A dim display can indicate a low battery.
Watch Not Responding to Buttons
- Ensure the watch is not in a locked mode (though this model typically does not have one).
- Try pressing all buttons firmly.
- If unresponsive, the battery may be completely depleted.
Specifications
| Feature | Detail |
|---|---|
| Brand | cofuo |
| Model Number | CF-1100-B |
| Dial Case Diameter | 1.30 inch / 3.3 cm |
| Dial Case Thickness | 0.51 inch / 1.3 cm |
| Band Width | 0.71 inch / 1.8 cm |
| Band Length | 8.74 inch / 22.2 cm |
| Watch Weight | 2.40 oz / 68 g |
| Water Resistance | 50M (5 ATM) |
| Battery Type | Product Specific (CR2025) |
| Case Material | PC material |
| Band Material | Silicone |
| Mirror Surface | Highly Transparent Resin Glass |

Image Description: A diagram illustrating the physical specifications of the watch, including band length (8.74 in / 22.2 cm), band width (0.5 in / 1.2 cm), case thickness (0.51 in / 1.3 cm), case diameter (1.30 in / 3.3 cm), maximum fit wrist (8.07 in / 20.5 cm), minimum fit wrist (5.91 in / 15 cm), product weight (1.60 oz / 46 g), and battery code (CR2025).
Warranty and Support
Your cofuo watch is manufactured with high-quality materials and undergoes strict quality control. For any manufacturing defects or issues not covered by normal wear and tear, please contact cofuo customer support.
For further assistance, troubleshooting, or warranty claims, please visit the official cofuo store on Amazon or contact their customer service directly. Refer to your purchase receipt for specific warranty terms and contact details.
Online Store: cofuo Official Store on Amazon