CHKOSDA CH3387-W
CHKOSDA LED Large Digital Wall Clock User Manual
Model: CH3387-W
Introduction
This user manual provides comprehensive instructions for the CHKOSDA LED Large Digital Wall Clock (Model: CH3387-W). It covers product features, setup, operation, maintenance, and troubleshooting to ensure optimal performance and longevity of your device. Please read this manual thoroughly before operating the clock.
Product Overview
The CHKOSDA LED Large Digital Wall Clock is designed for clear visibility and versatile functionality. Key features include:
- 6-inch LED Numbers: Provides long-distance readability and clear identification.
- 8-Level Adjustable Brightness: Allows for customization of display intensity, including an auto-dimmer function for optimal viewing day and night.
- Frameless and Ultra-thin Design: Features a sleek ABS plastic shell that is fire-retardant, lightweight, and strong.
- AC Power and Energy Saving: Corded electric operation ensures stable power, with LED technology providing energy efficiency. Includes a CR2032 coin cell slot for memory backup (coin cell does not power the clock).
- Huge Countdown/Count-up Timer: Supports ultra-long countdowns up to 364 days, 23 hours, 59 minutes, 59 seconds, and count-up timing.
- Remote Control: Allows convenient adjustment of settings from up to 49 ft away.
- Integrated Calendar and Thermometer: Displays date and temperature for added utility.

This image displays the large digital numbers of the clock, showing the time 20:30. The sleek, frameless design is evident, highlighting the clear LED display.
What's in the Box
Upon opening the product packaging, you should find the following items:
- 1 x CHKOSDA LED Large Digital Wall Clock
- 1 x Remote Control
- 1 x USB Power Cable (10 feet)
- 1 x Power Adapter
- 1 x User Manual

This image shows the clock, remote control, USB cable, and power adapter, along with icons indicating various functions like time display, calendar, remote control, countdown, count-up, alarm, auto dimmer, temperature, backup, and 12/24 hour mode.
Setup
Powering the Clock
- Connect the USB power cable to the clock's power cord slot. The slot supports 4 directions for flexible placement.
- Plug the USB cable into the provided power adapter.
- Insert the power adapter into a standard electrical outlet. The clock will power on and display the current time.
- (Optional) Insert a CR2032 coin cell battery into the battery compartment on the back of the clock. This battery is for memory backup only and does not power the display. It ensures time and settings are retained during power outages.

The image shows the clock plugged into a wall outlet via its USB cable and power adapter. It clarifies that the clock is not battery operated for display, but a CR2032 battery can be used for memory backup.
Mounting the Clock
The clock can be wall-mounted or placed on a table using its standback support.
- Wall Mounting: Use the two hanging holes on the back of the clock to secure it to a wall using appropriate screws or hooks (not included).
- Table Placement: Extend the standback support on the rear of the clock to place it securely on any flat surface.

This image highlights the hanging holes for wall mounting and the retractable standback support for table placement. It also shows the battery compartment and power cord slot.
Operating Instructions
All clock functions are controlled via the included remote control.
Remote Control Overview

The remote control features a power button, number pad, mode button, set buttons for time, calendar, and countdown, along with up/down arrows for adjustments. It also has dedicated buttons for brightness, alarm on/off, and flash.
Setting Time and Date
- Press the "T SET" button on the remote to enter time setting mode. The hour digits will start blinking.
- Use the "UP" or "DOWN" buttons to adjust the hour.
- Press the "MODE" button to switch to minute adjustment. The minute digits will blink.
- Use the "UP" or "DOWN" buttons to adjust the minutes.
- Press the "MODE" button again to switch to seconds adjustment. Use "UP" or "DOWN" to set seconds.
- Press the "RET" (Return) button to exit time setting mode.
- To set the date, press the "C SET" button. The year will blink. Adjust using "UP" or "DOWN", then press "MODE" to move to month, and again for day. Press "RET" to exit.
This video demonstrates the step-by-step process of setting the current time using the remote control's "T SET" and "MODE" buttons, along with the "UP" and "DOWN" adjustment keys.
Brightness Adjustment
The clock offers 8 levels of brightness adjustment and an auto-dimmer function.
- Auto Dimmer: The clock has a built-in light sensor that automatically adjusts brightness based on ambient light conditions. This is the default mode.
- Manual Adjustment: Press the "DIM" button on the remote to switch between auto and manual brightness modes. In manual mode, use the "+" and "-" buttons (located near the bottom of the remote) to cycle through the 8 fixed brightness levels.

This image illustrates the 8 different brightness levels (Lv.1 to Lv.8) of the LED display, demonstrating the range from dim to very bright. It also shows the auto-dimmer function.
Countdown/Count-up Timer
The clock supports both countdown and count-up functions.
- Setting Countdown:
- Press "CD SET" twice to enter countdown setting.
- The display will show "d:00". Use "UP" or "DOWN" to set the number of days (up to 999). Press "MODE" to confirm.
- Set hours, minutes, and seconds similarly, pressing "MODE" after each to advance.
- The last step allows you to choose if the countdown can be repeated ("on") or not ("--"). Adjust with "UP" or "DOWN".
- Press "RET" to save and exit.
- Starting/Pausing/Resetting:
- To start the countdown/count-up, press the Play/Pause button (triangle icon).
- Press Play/Pause again to pause.
- To reset the timer, press the "RET" button.
This video provides a comprehensive overview of the clock's features, including the countdown and count-up timer functions, demonstrating how to set and operate them. It also highlights the large display and remote control.
This short video specifically demonstrates how to set a countdown for a specific number of seconds, such as 30 seconds, using the remote control's "CD SET" and adjustment buttons.
This video provides instructions on setting a countdown for a longer duration, such as 5 minutes and 30 seconds, detailing the use of the remote control for precise time input.
Alarm Setting
The clock supports up to 16 alarm groups (AL01-AL16).
- Press the "AL SET" button to enter alarm setting mode. "AL01" will blink.
- Use "UP" or "DOWN" to select the desired alarm group (AL01-AL16).
- Press "MODE" to switch to alarm hour adjustment. The hour digits will blink. Adjust with "UP" or "DOWN".
- Press "MODE" to switch to alarm minute adjustment. Adjust with "UP" or "DOWN".
- Press "MODE" again to toggle the alarm ON or OFF. ("--" indicates OFF, "on" indicates ON).
- Press "RET" to save and exit.
- To quickly turn an alarm on/off, use the "AL ON/OFF" button on the remote.
Temperature Display
The clock can display temperature in Celsius or Fahrenheit.
- Press the "C/F" button on the remote to switch between Celsius and Fahrenheit display.
12/24 Hour Mode
The clock supports both 12-hour and 24-hour time formats.
- Press the "12/24" button on the remote to toggle between the 12-hour and 24-hour display modes.
Maintenance
- Cleaning: Use a soft, dry cloth to clean the clock's display and body. Avoid abrasive cleaners or solvents that may damage the surface.
- Power: Ensure the clock is connected to a stable power source. Avoid frequent power interruptions.
- Environment: Keep the clock in a dry environment. Avoid exposure to extreme temperatures, direct sunlight for prolonged periods, and high humidity.
Troubleshooting
| Problem | Possible Cause / Solution |
|---|---|
| Clock display is too bright/dim. | Check brightness settings. Press "DIM" button to toggle auto/manual mode. Use "+"/"-" buttons for manual adjustment. |
| Remote control not working. | Ensure the remote has working AAA batteries (2 required, not included). Check for obstacles between the remote and the clock. Ensure you are within the 49 ft operating range. |
| Clock loses time/settings after power off. | Ensure a CR2032 coin cell battery is installed correctly for memory backup. The clock requires continuous AC power for display. |
| Instructions are difficult to understand. | Refer to the official video tutorials provided by CHKOSDA for visual guidance on setting functions. Contact customer support if issues persist. |
| Clock stuck in a mode (e.g., rotating time, date, temp). | Press the "RET" button to return to the main time display. If unresponsive, unplug the clock from power for a few minutes, then plug it back in. |
Specifications
| Feature | Detail |
|---|---|
| Brand | CHKOSDA |
| Model Number | CH3387-W |
| Display Type | Digital LED |
| Number Height | 6 inches |
| Product Dimensions | 17.6"W x 6.3"H |
| Item Weight | 15.8 ounces (0.45 Kilograms) |
| Power Source | Corded Electric (USB) |
| Brightness Levels | 8 (Adjustable + Auto Dimmer) |
| Special Features | Large Display, Timer (Count-up/Countdown), Adjustable Brightness, Temperature Display, Alarm, Calendar |
| Material | ABS Plastic |
| Mounting Type | Wall Mount / Tabletop |
Warranty & Support
The product comes with a manufacturer's warranty. For specific warranty details or support inquiries, please refer to the official user manual PDF or contact the seller directly.
- Official User Manual (PDF): Download Here
- Seller: CHKOSDA
- For product quality problems or further assistance, please contact the seller through the Amazon platform.
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