Introduction
Thank you for choosing the RONXS Digital Alarm Clock. This device is designed to provide accurate timekeeping, alarm functions, temperature display, and date information in a compact and user-friendly design. Please read this manual carefully to ensure proper use and to get the most out of your new alarm clock.
Safety Information
- Keep the device away from water and high humidity.
- Do not expose the device to extreme temperatures or direct sunlight.
- Use only the specified battery type (3 AAA batteries, not included).
- Do not attempt to disassemble or repair the device yourself. Contact customer support if issues arise.
- Keep out of reach of small children to prevent choking hazards from small parts.
Package Contents
- 1 x RONXS Digital Alarm Clock
- 1 x User Manual
Product Overview
Familiarize yourself with the various parts and controls of your RONXS Digital Alarm Clock.

Image: Front and rear view of the alarm clock with labels for Time, Alarm, Date, Temperature, Snooze/Light button, MIN/DATE, HOUR/MONTH, 12/24, YEAR, AL.ON, AL.OFF, SENSOR ON/OFF, LOCK, AL.SET, DATE SET, TIME SET, and SPEAKER. Also indicates battery compartment for 3*AAA batteries (not included).

Image: Front view of the alarm clock showing dimensions (2.9"/7.5cm height, 5.3"/13.5cm width, 1.85"/4.7cm depth) and recommending a viewing angle of 15-60 degrees below the display for clarity.
Display Elements:
- Time: Displays current time (AM/PM indicator for 12-hour mode).
- Alarm: Shows the set alarm time.
- Date: Displays month and day.
- Temperature: Shows indoor temperature in Celsius or Fahrenheit.
- Snooze Indicator (Zz): Appears when snooze is active.
- Alarm On Indicator: Indicates if the alarm is active.
Buttons and Switches:
- SNOOZE/LIGHT Button (Top): Activates snooze during alarm, turns on backlight.
- MIN/DATE Button: Used to adjust minutes or set the date.
- HOUR/MONTH Button: Used to adjust hours or set the month.
- 12/24 Button: Toggles between 12-hour and 24-hour time format.
- YEAR Button: Used to set the year.
- °C/°F Button: Toggles between Celsius and Fahrenheit temperature display.
- AL.ON/AL.OFF Switch: Turns the alarm on or off.
- LOCK/AL.SET/DATE SET/TIME SET Switch: Main mode switch for setting time, date, and alarm.
- SENSOR ON/OFF Switch: Activates or deactivates the automatic backlight sensor.
Setup
1. Install Batteries
- Open the battery compartment cover on the back of the clock.
- Insert 3 new AAA batteries (not included), ensuring correct polarity (+/-).
- Close the battery compartment cover.
2. Set Time
- Slide the main mode switch (on the back) to TIME SET.
- Press the HOUR/MONTH button to adjust the hour.
- Press the MIN/DATE button to adjust the minutes.
- Once the correct time is set, slide the main mode switch back to LOCK.
3. Set Date and Year
- Slide the main mode switch to DATE SET.
- Press the YEAR button to set the current year.
- Press the HOUR/MONTH button to set the current month.
- Press the MIN/DATE button to set the current day.
- Once the correct date is set, slide the main mode switch back to LOCK.
4. Select 12/24 Hour Format
- In LOCK mode, press the 12/24 button to switch between 12-hour (with AM/PM indicator) and 24-hour formats.
5. Select Temperature Unit
- In LOCK mode, press the °C/°F button to switch between Celsius and Fahrenheit.
Operating Instructions
1. Setting the Alarm
- Slide the main mode switch to AL.SET.
- Press the HOUR/MONTH button to adjust the alarm hour.
- Press the MIN/DATE button to adjust the alarm minutes.
- Once the desired alarm time is set, slide the main mode switch back to LOCK.
2. Activating/Deactivating the Alarm
- To activate the alarm, slide the AL.ON/AL.OFF switch to AL.ON. An alarm icon will appear on the display.
- To deactivate the alarm, slide the AL.ON/AL.OFF switch to AL.OFF. The alarm icon will disappear.
3. Alarm Modes (Ring Each Day / Ring On Workday)

Image: Close-up of the alarm mode switch on the back of the clock. It shows positions for 'work AL.ON', 'AL.ON', and 'AL.OFF'.
- Ring Each Day: Slide the AL.ON/AL.OFF switch to AL.ON. The alarm will sound every day (Monday to Sunday). The icon 'MO-SU' will be displayed.
- Ring On Workday: Slide the AL.ON/AL.OFF switch to work AL.ON. The alarm will only sound from Monday to Friday. It will not ring on weekends. Ensure the date is set correctly for this mode to function as intended. The icon 'MO-FR' will be displayed.
4. Snooze Function

Image: A hand pressing the large SNOOZE/LIGHT button on top of the alarm clock while the alarm is sounding. This action provides an additional 5 minutes of sleep.
- When the alarm sounds, press the large SNOOZE/LIGHT button on top of the clock. The alarm will pause for 5 minutes and then sound again.
- The snooze indicator (Zz) will flash on the display.
- To cancel the snooze and stop the alarm completely, slide the AL.ON/AL.OFF switch to AL.OFF.
5. Backlight / Night Light
- Manual Backlight: Press the SNOOZE/LIGHT button on top to temporarily illuminate the display.
- Automatic Backlight (Sensor): Slide the SENSOR ON/OFF switch to ON. The clock will automatically adjust the backlight brightness based on ambient light conditions, providing a soft glow in dark environments. Slide to OFF to disable this feature.
Maintenance
- Cleaning: Wipe the clock with a soft, dry cloth. Do not use abrasive cleaners or solvents.
- Battery Replacement: When the display dims or functions become erratic, replace all 3 AAA batteries with new ones. Do not mix old and new batteries or different types of batteries.
- Storage: If storing the clock for an extended period, remove the batteries to prevent leakage.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Display is blank or dim. | Low or dead batteries. Incorrect battery installation. | Replace with new AAA batteries, ensuring correct polarity. |
| Digits disappear automatically after a few seconds. | This behavior is not standard for a continuously displaying digital clock. It may indicate a faulty unit or a specific power-saving mode not clearly documented. | Ensure batteries are fresh. If the issue persists, contact customer support for assistance or replacement. |
| Alarm does not sound. | Alarm is not activated. Alarm volume is too low (if adjustable). Incorrect alarm time set. | Ensure the AL.ON/AL.OFF switch is in the AL.ON or work AL.ON position. Verify the alarm time is set correctly. (Note: This model does not appear to have adjustable alarm volume). |
| Time or date is incorrect. | Not set correctly. | Refer to the "Set Time" and "Set Date and Year" sections in this manual. |
| Backlight is not working. | Sensor is off. Low batteries. | Ensure the SENSOR ON/OFF switch is ON for automatic backlight. Press the SNOOZE/LIGHT button for manual backlight. Replace batteries if needed. |
Specifications
| Feature | Detail |
|---|---|
| Brand | RONXS |
| Model Number | JG878HKJHKJH |
| ASIN | B0GD7VJJ9Z |
| Color | Black |
| Material | Plastic (ABS) |
| Display Type | Digital LED |
| Product Dimensions (L x W x H) | 12 x 3.81 x 8 cm |
| Item Weight | 256 grams |
| Power Source | 3 x AAA Batteries (not included) |
| Special Features | Cordless, Snooze, Night Light, Temperature Display, Calendar, 12/24 Hour Mode |
| Mounting Type | Tabletop |
Warranty and Support
This product is covered by a standard manufacturer's warranty. For specific warranty details, please refer to the product packaging or contact your retailer. If you encounter any issues or have questions regarding your RONXS Digital Alarm Clock, please contact the seller or manufacturer directly for support.
Manufacturer: RONXS
Importer Contact Information: RONXS