Introduction
Thank you for choosing the Netzu K028B Digital Alarm Clock. This manual provides detailed instructions for setting up, operating, and maintaining your new alarm clock. Please read this manual thoroughly before use to ensure optimal performance and longevity of the product.
Key Features
- Digital Time Display with 5 Brightness Levels
- Integrated Night Light with 5 Brightness Levels
- 10 Selectable Ringtones with 10 Volume Settings
- 9-Minute Snooze Function
- Adjustable Nap Timer (15 to 120 minutes)
- Child Lock Feature to prevent accidental setting changes
- Plug-in Use with CR2025 Battery for Power-Off Memory
Setup
1. Power Connection
The Netzu K028B Digital Alarm Clock is designed for plug-in use. Connect the provided USB cable to the clock's power port and plug the adapter into a standard electrical outlet. The clock will power on automatically.

Image: The Netzu K028B Digital Alarm Clock connected to a wall outlet via its power cable, illustrating its plug-in operation.
2. Battery Memory Function
A built-in CR2025 battery (not included for initial setup, but typically pre-installed for memory) preserves your time and alarm settings during power outages or when the clock is unplugged. This battery is for memory backup only and does not power the main display or night light.

Image: The underside of the alarm clock, highlighting the CR2025 battery compartment for memory backup.
3. Initial Time Setting
Upon first power-on or after a prolonged power loss without battery backup, the display may show a default time. Refer to the 'Operating Instructions' section for detailed steps on setting the current time.
Operating Instructions
The control buttons are located on the back of the alarm clock. Familiarize yourself with their functions:
| Icon | Function |
|---|---|
| SET | Enter/Confirm settings mode |
| ▲ / ▼ | Adjust values (Up/Down) |
| ON/OFF | Turn alarm on/off |
| 12/24 | Switch between 12-hour and 24-hour time format |
| ♪ | Select alarm ringtone |
| Zz | Activate Nap Timer |
| 🔒 | Activate/Deactivate Child Lock |
| 🔆 | Adjust display brightness |
| 💡 | Adjust night light brightness |
1. Setting the Time
- Press and hold the SET button until the hour digits flash.
- Use the ▲ or ▼ buttons to adjust the hour.
- Press SET again to move to minute adjustment. Use ▲ or ▼ to adjust minutes.
- Press SET to confirm and exit time setting.
- To switch between 12-hour and 24-hour format, press the 12/24 button.
2. Setting the Alarm
- Press the SET button once (do not hold) to enter alarm setting mode. The alarm time will flash.
- Use ▲ or ▼ to adjust the alarm hour. Press SET to confirm.
- Use ▲ or ▼ to adjust the alarm minute. Press SET to confirm.
- Press the ♪ button to cycle through 10 different alarm ringtones.
- Use ▲ or ▼ to adjust the alarm volume (10 levels).
- Press SET to save and exit alarm setting.
- To turn the alarm on or off, press the ON/OFF button. An alarm icon will appear/disappear on the display.

Image: The alarm clock's display showing different ringtone options and volume settings, indicating customization features.
3. Snooze Function
When the alarm sounds, press the top 'toast' part of the clock or the dedicated snooze button (if available, otherwise the main button used for light/snooze) to activate the 9-minute snooze function. The alarm will temporarily stop and sound again after 9 minutes.

Image: The alarm clock on a bedside table, with the snooze function indicated by a hand pressing the top 'toast' part.
4. Night Light Operation
The night light is integrated into the 'toast' part of the clock. Press the 💡 button to turn the night light on/off. Continue pressing the 💡 button to cycle through 5 brightness levels.

Image: The alarm clock functioning as a night light, illustrating its 5 adjustable brightness levels for both the light and the clock display.
5. Display Brightness Adjustment
To adjust the brightness of the digital time display, press the 🔆 button. There are 5 brightness levels to choose from, allowing you to find a comfortable setting for day or night.
6. Nap Timer
The nap timer allows you to set a countdown for short periods. Press the Zz button to activate the nap timer. Repeatedly press Zz to cycle through preset durations: 15, 30, 60, 90, or 120 minutes. The timer will count down and sound an alarm when finished.

Image: The alarm clock displaying various nap timer options, from 15 to 120 minutes, for managing fragmented schedules.
7. Child Lock
To prevent accidental changes to settings, activate the child lock. Press and hold the 🔒 button until the lock icon appears on the display. In child lock mode, only the night light and screen brightness adjustments are functional. To deactivate, press and hold the 🔒 button again until the lock icon disappears.

Image: The alarm clock with its various features including child lock, shown alongside its dimensions and accessories.
Maintenance
1. Cleaning
To clean the alarm clock, gently wipe the surface with a soft, dry cloth. Do not use abrasive cleaners, solvents, or immerse the device in water.2. Battery Replacement (Memory)
If the clock loses its time and alarm settings immediately after a power outage, the internal CR2025 memory battery may need replacement. Carefully open the battery compartment on the underside of the clock and replace the battery with a new CR2025 cell, ensuring correct polarity.
Troubleshooting
- Clock not turning on: Ensure the power adapter is securely plugged into both the clock and a working electrical outlet.
- Alarm not sounding: Verify that the alarm is turned ON (alarm icon visible on display) and the volume is set to an audible level.
- Settings changing unexpectedly: Check if the Child Lock feature is deactivated. Activate it to prevent unintended adjustments.
- Time/settings reset after unplugging: The CR2025 memory battery may be depleted or missing. Replace it if necessary.
Specifications
| Feature | Detail |
|---|---|
| Brand | Netzu |
| Model Number | K028B |
| Color | Blue |
| Display Type | Digital |
| Special Features | Adjustable Brightness, Illuminated Night Light, Nap Timer, Snooze, Child Lock |
| Product Dimensions | 5.51"W x 4.13"H |
| Power Source | Corded Electric |
| Memory Battery | CR2025 (for settings backup) |
| Material | Plastic |
| Room Type | Bedroom |
Warranty and Support
For warranty information or technical support, please refer to the product packaging or contact Netzu customer service through the retailer where the product was purchased. Keep your purchase receipt as proof of purchase.