CHKOSDA CH3389-W
CHKOSDA Digital Wall Clock User Manual
Model: CH3389-W
Brand: CHKOSDA
Introduction
Thank you for choosing the CHKOSDA Oversize LED Digital Wall Clock. This clock is designed to provide clear time display, along with additional features such as date, temperature, countdown timer, stopwatch, and multiple alarms. Its large display and automatic dimmer make it suitable for various environments, including homes, offices, and public spaces. This manual provides detailed instructions for setup, operation, and maintenance to ensure optimal performance and longevity of your device.
Product Overview
The CHKOSDA Digital Wall Clock features a large, easy-to-read LED display with 6-inch high digits. It is equipped with an ultra-thin design and a high-strength ABS integration shell, ensuring both durability and a sleek appearance. The display panel cover is made of acrylic for clear visibility.

Image: The CHKOSDA Digital Wall Clock with its large, clear LED display showing the time.
Key Features:
- Large LED Display: 27-inch wide screen with 6-inch high white digits for excellent readability from a distance.
- Multi-functional: Displays time, date, and temperature. Includes countdown timer, stopwatch, and up to 16 alarm settings.
- Automatic and Manual Dimmer: Features an auto-dimmer that adjusts brightness based on ambient light, and 8 levels of manual brightness control via remote.
- Durable Construction: Acrylic display panel cover and high-strength ABS shell.
- Memory Battery Slot: Supports a CR2032 button cell battery (not included) to maintain time accuracy when disconnected from power. Note: The button battery does not power the clock display.

Image: A diagram illustrating the dimensions (27.55 inches L, 6.49 inches H, 1.02 inches W), keyhole for mounting, USB power input, and battery compartment for CR2032. Icons represent Time Display, Calendar, Remote Control, Countdown, Count up, Alarm, Auto Dimmer, Temperature, 6-inch Font, and 12/24 Hour display.
Package Contents
- CHKOSDA Digital Wall Clock (Model: CH3389-W)
- Remote Control
- USB Power Cable (3 meters)
- User Manual (this document)
Setup
1. Power Connection:
Connect the provided 3-meter USB power cable to the clock's USB input port. Plug the other end of the cable into a compatible USB power adapter (not included) and then into a standard wall outlet. The clock will power on and display the default time.
2. Battery Installation (for memory backup):
The clock requires a CR2032 button cell battery (not included) for time memory backup during power outages. Locate the battery compartment on the back of the clock. Insert one CR2032 battery with the positive (+) side facing up. This battery ensures the clock maintains accurate time settings when disconnected from the main power source, but it does not power the display.
3. Wall Mounting:
The clock is designed for wall mounting. Use the keyhole slots located on the back of the clock to hang it securely on screws or hooks installed in your wall. Ensure the mounting hardware is appropriate for the clock's weight (approximately 1.9 kg).
Operating Instructions
All functions of the clock are controlled using the included remote control. Ensure the remote has working batteries and is pointed towards the clock for optimal response.
1. Setting Time and Date:
- Press the SET button on the remote to enter time setting mode.
- Use the number buttons (0-9) to input the desired time (HH:MM).
- Press SET again to confirm and move to date setting.
- Input the date (MM:DD:YY) using the number buttons.
- Press SET one more time to save and exit setting mode.
- To switch between 12-hour and 24-hour format, press the 12/24H button.
2. Displaying Temperature:
The clock can display the ambient temperature. Press the TEMP button on the remote to toggle between time, date, and temperature display modes.
3. Brightness Adjustment:

Image: The clock display adjusting brightness automatically based on ambient light, and a remote control showing buttons for manual brightness adjustment.
- Automatic Dimmer: The clock is equipped with an automatic dimmer that adjusts the display brightness based on the surrounding light conditions. This mode is activated by default or by pressing the DIM button until 'AUTO' is displayed.
- Manual Brightness Control: To manually adjust brightness, press the DIM button repeatedly to cycle through 8 levels of brightness. Use the + and - buttons on the remote for fine adjustment within manual mode.
4. Alarm Settings:
The clock supports up to 16 independent alarms.
- Press the ALARM button to enter alarm setting mode.
- Use the number buttons to set the desired alarm time.
- Press ALARM again to confirm and set additional alarms or exit.
- To enable/disable an alarm, select the alarm number and press the ON/OFF button.
5. Countdown Timer and Stopwatch:

Image: The clock display showing a countdown timer (00:03:15) and text indicating stopwatch, timer (up to 999 days), and alarm (up to 16 groups) functionalities.
- Countdown Timer: Press the COUNTDOWN button. Use the number buttons to set the desired countdown duration (up to 999 days). Press START/STOP to begin or pause the countdown. Press RESET to clear.
- Stopwatch: Press the STOPWATCH button. Press START/STOP to begin or pause the stopwatch. Press RESET to clear.
Maintenance
Cleaning:
To clean the clock, gently wipe the display and casing with a soft, dry, lint-free cloth. Do not use abrasive cleaners, solvents, or spray directly onto the clock, as this may damage the surface or internal components.
Battery Replacement (Remote Control):
If the remote control's response becomes sluggish or stops working, replace its batteries. Refer to the remote control's battery compartment for the correct battery type and orientation.
Battery Replacement (Memory Backup):
If the clock loses time settings after a power disconnection, the CR2032 button cell battery for memory backup may need replacement. Follow the instructions in the 'Setup' section for proper installation.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Clock display is off. | No power supply; loose power cable. | Ensure the USB power cable is securely connected to the clock and a working power outlet. Check the power adapter. |
| Remote control is not working. | Remote batteries are dead or incorrectly inserted; obstruction between remote and clock. | Replace remote batteries, ensuring correct polarity. Remove any obstructions. Point the remote directly at the clock. |
| Clock loses time settings after power disconnection. | CR2032 memory battery is dead or not installed. | Install a new CR2032 button cell battery or replace the existing one. |
| Display is too dim or too bright. | Brightness setting is incorrect; auto-dimmer issue. | Press the DIM button on the remote to cycle through brightness levels or activate auto-dimmer mode. |
| Time/Date is incorrect. | Time/Date not set correctly. | Follow the 'Setting Time and Date' instructions in the 'Operating Instructions' section to reset the time and date. |
Specifications
| Feature | Detail |
|---|---|
| Brand | CHKOSDA |
| Model Number | CH3389-W |
| Color | White |
| Product Dimensions (L x W x H) | 73.99 x 3.81 x 19.81 cm (29.13 x 1.5 x 7.8 inches) |
| Item Weight | 1.9 Kilograms (4.19 lbs) |
| Material | Acrylic (display panel), ABS (shell) |
| Display Type | Digital LED |
| Special Features | Temperature Display, Adjustable Brightness, Timer, Calendar Display, Alarm |
| Power Source | Corded Electric (USB cable) |
| Battery Requirement (Memory) | 2 x CR2032 (not included, for time memory only) |
Warranty and Support
For warranty information and customer support, please refer to the documentation provided at the time of purchase or contact the seller directly. Keep your purchase receipt as proof of purchase for any warranty claims.
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