CHKOSDA CH3389
CHKOSDA CH3389 Digital Wall Clock User Manual
Model: CH3389
Introduction
This manual provides detailed instructions for the setup, operation, and maintenance of your CHKOSDA CH3389 Digital Wall Clock. Please read this manual thoroughly before use to ensure proper functionality and to maximize your product experience.
What's Included
Verify that all items are present in the package:
- CHKOSDA CH3389 Digital Wall Clock
- Remote Control
- User Manual
- USB Power Cord (10 ft)
- Power Adapter

Image: Package contents of the CHKOSDA CH3389 Digital Wall Clock.
Product Overview
The CHKOSDA CH3389 is a large digital wall clock designed for clear visibility and versatile functionality. It features a 28.4-inch LED display with 5.9-inch extra-large digits, an ultra-narrow bezel, and flame-retardant material. Key functions include time display, calendar, temperature, alarm, countdown, count-up timer, and adjustable brightness.

Image: Front view of the CHKOSDA CH3389 Digital Wall Clock and its remote control.

Image: Overview of the CHKOSDA CH3389 Digital Wall Clock's dimensions and multifunctional features.
Key Features:
- Large Display: 28.4-inch LED with 5.9-inch digits for clear visibility up to 100 feet.
- Adjustable Brightness: 8 fixed levels and automatic dimming mode.
- Multifunction: Time, Date, Temperature, Alarm, Countdown, Count-up, Stopwatch.
- Time Formats: Easily switch between 12-hour and 24-hour display.
- Backup Battery: CR2032 button battery (not included) preserves settings during power outages.
- Remote Control: Operates within 30 feet.
Setup
1. Power Connection
- Connect the provided USB power cord to the clock's USB port.
- Plug the power adapter into a standard electrical outlet.
- The clock will power on and display the default time.

Image: Rear view of the clock showing power input and battery compartment.
2. Remote Control Battery Installation
The remote control requires a CR2032 button battery (not included). Open the battery compartment on the back of the remote and insert the battery with the correct polarity.
3. Mounting the Clock
The clock can be mounted on a wall using the hanging holes located on the back. Ensure the mounting surface is secure and use appropriate hardware (not included) for installation.

Image: The clock's high visibility and remote control range.
Operating Instructions
All functions are controlled via the included remote control.
1. Time Display and Format
- The clock displays time, date, and temperature.
- To switch between 12-hour and 24-hour formats, press the dedicated button on the remote.

Image: Switching between 12-hour and 24-hour time formats.

Image: The clock's three display modes: Time, Date, and Temperature.
2. Brightness Adjustment
The clock offers two brightness modes:
- Fixed Brightness: Choose from 8 adjustable levels using the remote control.
- Automatic Dimming: The clock automatically adjusts its brightness based on ambient light conditions.

Image: Fixed and automatic brightness adjustment modes.

Image: Detailed illustration of the three brightness functions.
3. Timer Functions (Countdown & Stopwatch)
The clock includes both countdown and count-up (stopwatch) timer functionalities.
- Use the remote control to select and set the desired timer mode.
- Countdown Timer: Set a specific duration, and the clock will count down to zero.
- Stopwatch (Count-up): Start from zero and count upwards.

Image: Examples of countdown and count-up timer functions.
4. Alarm Settings
The clock supports up to 16 individual alarm settings.
- Press the "Alarm" button on the remote to enter alarm setting mode.
- Use the navigation buttons to select an alarm slot (AL 01 - AL 16) and set the desired time.
- Confirm your settings to activate the alarm.

Image: Setting multiple alarms on the digital clock.
5. Temperature Display
The clock can display temperature in both Fahrenheit (°F) and Celsius (°C).
- Use the remote control to switch between Fahrenheit and Celsius display modes.

Image: Temperature display in Fahrenheit and Celsius.
Maintenance
- Cleaning: Use a soft, dry cloth to clean the clock's display and casing. Avoid abrasive cleaners or solvents.
- Power: Ensure the clock is connected to a stable power source.
- Backup Battery: Replace the CR2032 button battery in the clock (if installed) and remote control annually or as needed to maintain settings during power interruptions.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Clock does not power on. | No power supply; loose connection. | Check power adapter and USB cable connection. Ensure outlet is functional. |
| Remote control not working. | Remote battery depleted or incorrectly installed; obstruction. | Replace CR2032 battery in the remote. Ensure correct polarity. Remove any obstructions between remote and clock. Ensure you are within 30 feet of the clock. |
| Time/settings reset after power outage. | Backup battery (CR2032) in clock is depleted or not installed. | Install or replace the CR2032 button battery in the clock's backup compartment. Note: This battery only preserves settings, it does not power the clock. |
| Display is too dim or too bright. | Brightness settings incorrect; automatic dimming active. | Adjust fixed brightness levels using the remote. If in auto-dimming mode, ambient light will dictate brightness. |
Specifications
| Feature | Detail |
|---|---|
| Brand | CHKOSDA |
| Model Number | CH3389 |
| Display Type | Digital LED |
| Product Dimensions | 27.55"W x 6.5"H |
| Power Source | Corded Electric (USB 10ft cable) |
| Special Features | Adjustable Brightness, Alarm, Auto Dimmable, Large Display, Timer (Countdown/Stopwatch) |
| Backup Battery | CR2032 (for settings memory, not included) |
| Remote Control Range | Up to 30 feet |
| Item Weight | 4.59 pounds (2.09 Kilograms) |
| UPC | 777989116168 |
Warranty and Support
The CHKOSDA CH3389 Digital Wall Clock comes with a 12-month warranty from the date of purchase. This warranty covers manufacturing defects and workmanship under normal use.
For technical support, troubleshooting assistance, or warranty claims, please contact CHKOSDA customer service through the retailer where the product was purchased or refer to the contact information provided on the official CHKOSDA website.
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