1. Product Overview
The Karlsson LED Mirror Alarm Clock KA5878DW is a digital alarm clock featuring a modern and elegant design. It incorporates a large, reflective mirror display that clearly shows the time and temperature. The clock is encased in a dark wood veneer, offering a sophisticated aesthetic suitable for various interior settings.

Front view of the Karlsson LED Mirror Alarm Clock, showcasing its digital time and temperature display on a reflective copper-toned surface, encased in dark wood.
Key Features:
- Digital LED display with mirror finish
- Time and temperature display
- Alarm function
- Dark wood veneer casing
- USB powered (cable included) with battery backup option
2. Setup
2.1 Power Connection
The alarm clock can be powered via the included USB cable or with 3x AAA batteries (not included).
- USB Power: Connect the small end of the provided USB cable into the 'DC 5V' port on the back of the alarm clock. Plug the USB-A end into a compatible USB power adapter (not included) or a powered USB port.
- Battery Power: Open the battery compartment on the back of the clock. Insert 3x AAA batteries, ensuring correct polarity (+/-). Batteries are primarily for backup and may not power the display continuously at full brightness.

The black USB power cable included with the alarm clock, featuring a standard USB-A connector on one end and a barrel jack connector on the other for power input.

Rear view of the alarm clock, showing the control buttons labeled 'SET', 'UP', 'DOWN', a 'RESET' button, the power input port (DC 5V), and the battery compartment for 3x AAA batteries.
2.2 Initial Time Setting
Upon first power-up, the display will illuminate. You may need to set the current time.
- Press and hold the 'SET' button on the back of the clock until the hour digits begin to flash.
- Use the 'UP' and 'DOWN' buttons to adjust the hour.
- Press 'SET' again to move to the minute digits, then use 'UP' and 'DOWN' to adjust the minutes.
- Press 'SET' one more time to confirm the time setting.
3. Operating Instructions
3.1 Setting the Alarm
- Press the 'SET' button once (do not hold) to enter alarm setting mode. The alarm icon will appear, and the hour digits will flash.
- Use the 'UP' and 'DOWN' buttons to set the desired alarm hour.
- Press 'SET' again to move to the minute digits, then use 'UP' and 'DOWN' to set the desired alarm minutes.
- Press 'SET' one more time to confirm the alarm setting. The alarm icon will remain on, indicating the alarm is active.
3.2 Activating/Deactivating Alarm
In normal time display mode, press the 'UP' button to toggle the alarm on or off. The alarm icon on the display indicates its status.
3.3 Snooze Function
When the alarm sounds, press any button (except 'RESET') to activate the snooze function. The alarm will temporarily stop and sound again after a few minutes (default snooze time is typically 5-9 minutes, refer to specific model details if available). To turn off the alarm completely, press the 'RESET' button or cycle the alarm off using the 'UP' button.
3.4 Display Brightness
The clock may feature adjustable display brightness. In normal time display mode, repeatedly press the 'DOWN' button to cycle through different brightness levels (e.g., bright, dim, off). This feature helps optimize visibility and conserve power.
3.5 Temperature Display
The clock automatically displays the ambient temperature alongside the time. The temperature unit (Celsius or Fahrenheit) may be switchable. To change the temperature unit, press and hold the 'DOWN' button in normal time display mode until the unit changes.
4. Maintenance
4.1 Cleaning
To maintain the appearance of your alarm clock, gently wipe the display and casing with a soft, dry, lint-free cloth. Avoid using abrasive cleaners, solvents, or chemical sprays, as these can damage the mirror finish or wood veneer.
4.2 Battery Replacement
If using batteries for backup, replace them when the display becomes dim or inconsistent, or if the clock loses time during power outages. Ensure the clock is disconnected from USB power before replacing batteries. Always use 3x new AAA batteries and dispose of old batteries responsibly.
5. Troubleshooting
- Display is blank: Ensure the USB cable is securely connected to a powered source, or that fresh AAA batteries are correctly inserted. Check the power adapter if using one.
- Clock loses time: Verify that the power source is stable. If using batteries, replace them. If connected via USB, ensure the power supply is consistent.
- Alarm does not sound: Check if the alarm is activated (alarm icon visible on display). Ensure the alarm volume is not set to zero (if adjustable).
- Buttons are unresponsive: Disconnect the power source (both USB and batteries) for a few minutes, then reconnect. This performs a soft reset. If issues persist, press the 'RESET' button on the back of the unit using a thin object (e.g., paperclip).
- Incorrect temperature reading: Ensure the clock is placed in an area with adequate air circulation, away from direct heat sources or cold drafts.
6. Specifications
| Feature | Detail |
|---|---|
| Model Number | PTG-KA5878DW |
| Brand | Karlsson |
| Material | Wood Veneer |
| Color | Dark Wood |
| Display Type | Digital LED |
| Dimensions (L x H x D) | 15 cm x 7 cm x 4.5 cm |
| Weight | Approximately 200 g |
| Power Source | USB (cable included), 3x AAA batteries (not included) |
| Special Feature | Alarm |
| Usage | Indoor |
7. Warranty Information
Specific warranty details for the Karlsson LED Mirror Alarm Clock KA5878DW are not provided in this manual. For information regarding warranty coverage, duration, and claims, please refer to the documentation included with your purchase or contact the retailer from whom the product was acquired.
8. Customer Support
If you encounter any issues or have questions not addressed in this manual, please contact the retailer or the official Karlsson customer support channels. Keep your purchase receipt and model number (PTG-KA5878DW) readily available when seeking assistance.





