1. Introduction
Thank you for choosing the VOKSUN Wireless Digital Weather Station Model 3378QX. This device provides comprehensive weather information and timekeeping functions for your home or office. It features a large, colorful LCD display, an external wireless sensor, and various practical functions to keep you informed about your environment.
Key features include:
- Indoor and outdoor temperature and humidity display.
- Weather forecast with trend indication.
- Barometric pressure display.
- Moon phase and sunrise/sunset times.
- DCF radio-controlled clock with date and day of the week.
- Dual alarm clock with snooze function.
- Adjustable backlight for optimal visibility.
- Comfort and mold risk indicators.
- Support for up to three external wireless sensors (one included).
2. Safety Information
- Read all instructions carefully before use.
- Do not expose the main unit to extreme temperatures, direct sunlight, or moisture.
- The outdoor sensor is weather-resistant but should be placed in a sheltered location to prolong its lifespan and ensure accurate readings.
- Use only specified power adapters and batteries.
- Keep out of reach of children.
- Do not attempt to disassemble or repair the device yourself. Contact customer support if issues arise.
3. Package Contents
- VOKSUN Digital Weather Station (Main Unit)
- Wireless Outdoor Sensor
- DC5V Power Adapter
- User Manual
4. Product Overview
4.1 Main Unit Display
The main unit features a large 7.5-inch HD LCD screen that displays all important information at a glance.

Image: The main weather station unit with its large, colorful LCD display showing indoor/outdoor temperature and humidity, time, date, weather forecast, moon phase, and barometric pressure.
4.2 Main Unit Buttons
- MODE: Switch display modes, enter settings.
- UP/+: Adjust values, toggle display.
- DOWN/-: Adjust values, toggle display.
- SNOOZE/LIGHT: Activate snooze, adjust backlight brightness.
- ALERT: Set temperature alerts.
- CHANNEL: Switch between outdoor sensor channels.
4.3 Outdoor Sensor
The wireless outdoor sensor measures external temperature and humidity. It has a small LCD display and a channel switch.

Image: The main weather station unit next to the wireless outdoor sensor, illustrating its compact design and the ability to support up to three channels.
- LCD Display: Shows current temperature and humidity.
- TX Button: Manually send data to the main unit.
- Channel Switch (1, 2, 3): Selects the transmission channel.
5. Setup
5.1 Powering the Main Unit
The main unit can be powered by the included DC5V adapter or by 2 x AA batteries (not included).
- Adapter Power: Connect the DC5V adapter to the main unit and a power outlet. The display will remain constantly lit (except during RCC signal search). It is recommended to insert batteries as a backup to retain settings during power outages.
- Battery Power: Insert 2 x AA batteries into the battery compartment. The display will not stay constantly lit to conserve power. Press the "SNOOZE/LIGHT" button to illuminate the screen for 15 seconds.

Image: Illustration of the two power supply methods for the main weather station unit: via DC adapter for continuous display and via AA batteries for portable use with a temporary backlight.
5.2 Installing Batteries in the Outdoor Sensor
The outdoor sensor requires 2 x AA batteries (not included).
- Open the battery compartment on the back of the outdoor sensor.
- Insert 2 x AA batteries, observing the correct polarity (+/-).
- Close the battery compartment securely.
5.3 Pairing Sensors
The main unit automatically searches for the outdoor sensor upon initial power-up. If pairing fails or you are adding additional sensors:
- Ensure both the main unit and the outdoor sensor have power.
- On the outdoor sensor, select a channel (1, 2, or 3) using the channel switch.
- Press the "TX" button on the outdoor sensor to send a signal.
- On the main unit, press and hold the "CHANNEL" button for 3 seconds to initiate a search for outdoor sensors. The outdoor temperature/humidity display will flash.
- Once connected, the outdoor temperature and humidity will appear on the main unit.
The weather station supports up to three external wireless sensors. If using multiple sensors, ensure each is set to a different channel (1, 2, or 3).

Image: A visual representation showing the weather station in a living room setting, with three separate images below it depicting potential locations for additional outdoor sensors (courtyard, bedroom, basement), highlighting its multi-sensor capability.
5.4 Initial Settings (Time, Date, Units)
After powering on, the unit will attempt to synchronize with the DCF radio signal. This may take several minutes or hours depending on your location. If you need to set the time manually or adjust other settings:
- Press and hold the "MODE" button for 3 seconds to enter time setting mode. The hour digit will flash.
- Use the "UP" or "DOWN" buttons to adjust the value.
- Press "MODE" to confirm and move to the next setting (Minute > Year > Month > Day > Time Zone > 12/24H format > Temperature Unit (°C/°F) > Pressure Unit (hPa/inHg)).
- Press "MODE" again to exit settings.
The DCF radio-controlled clock automatically synchronizes with the radio clock signal, ensuring accurate time. Select your time zone (-2 to +2), and the clock will adjust accordingly.

Image: A graphic illustrating the automatic time synchronization feature of the weather station via RCC & DCF radio signal, showing a map of Europe with signal coverage and examples of time adjustments for daylight saving.
6. Operating Instructions
6.1 Weather Forecast
The weather station calculates a weather forecast for the next 12-24 hours based on barometric pressure trends. It requires 7 to 10 days for barometric calibration to ensure an accurate forecast specific to your location.

Image: A series of weather icons (Sunny, Slightly Cloudy, Cloudy, Rainy, Stormy, Snowy) representing the weather forecast capabilities of the station, with a background map of the USA.
6.2 Alarm Clock Function
The weather station supports two independent alarms with a snooze function.
- Press "MODE" repeatedly until "AL1" or "AL2" is displayed.
- Press and hold "MODE" for 3 seconds to enter alarm setting mode. The hour digit will flash.
- Use "UP" or "DOWN" to adjust the hour, then press "MODE" to set minutes.
- Press "MODE" again to exit.
- To activate/deactivate an alarm, press "UP" or "DOWN" when the alarm is displayed. An alarm icon will appear/disappear.
- When the alarm sounds, press "SNOOZE/LIGHT" to activate snooze (5-60 minutes, adjustable in settings) or any other button to stop the alarm for 24 hours.

Image: A visual showing the weather station on a bedside table, with a person sleeping and another person stretching, illustrating the dual alarm and snooze features.
6.3 Adjustable Backlight
When powered by the DC adapter, the backlight is continuously on. Press the "SNOOZE/LIGHT" button to cycle through different brightness levels (High, Medium, Low, Off).
6.4 Comfort Indicator
The comfort indicator displays a face icon to show the current comfort level based on indoor temperature and humidity. It also indicates mold risk.

Image: The weather station on a bedside table next to a sleeping child, with an inset showing the comfort indicator icon (a smiling face) and mold risk percentage on the display.
6.5 Frost Alert
When the outdoor sensor temperature is between -1°C (+30°F) and +3°C (+37°F), the frost alert icon will flash, indicating potential icy conditions.

Image: A festive scene with people celebrating indoors, contrasted with a snowy outdoor scene featuring a cabin, and an inset showing the weather station display with a flashing frost alert icon.
6.6 Barometric Pressure Display
The weather station displays barometric pressure in either absolute (ABS) or relative (REL) values. Relative pressure can be adjusted to your local altitude for more accurate local forecasts.

Image: A scenic view of mountains and the sea, illustrating the concept of relative and absolute atmospheric pressure. Insets show the weather station display indicating "REL PRESSURE" and "ABS PRESSURE" with corresponding barometric readings.
7. Maintenance
7.1 Cleaning
Wipe the main unit and sensor with a soft, damp cloth. Do not use abrasive cleaners or solvents.
7.2 Battery Replacement
Replace batteries in the main unit and outdoor sensor when the low battery indicator appears on the display. Always replace all batteries at the same time with new ones of the same type.
7.3 Sensor Placement
For optimal performance, place the outdoor sensor in a shaded, dry location, protected from direct sunlight and precipitation. Ensure it is within the 60-meter wireless transmission range of the main unit.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No display on main unit | No power, dead batteries, or adapter issue. | Check adapter connection or replace batteries. |
| Outdoor temperature/humidity not displayed | Sensor not paired, out of range, or dead batteries. | Re-pair sensor (Section 5.3), move closer to main unit, replace sensor batteries. |
| Inaccurate readings | Sensor exposed to direct sunlight/rain, or near heat sources. | Relocate sensor to a shaded, sheltered area. |
| DCF time synchronization fails | Interference, weak signal, incorrect time zone. | Move unit away from electronic devices, try different location, ensure correct time zone setting. Manual time setting is an alternative. |
| Weather forecast seems incorrect | Initial calibration period not complete, local microclimates. | Allow 7-10 days for calibration. Forecasts are based on barometric trends and are not always 100% accurate for specific local conditions. |
9. Specifications
| Feature | Detail |
|---|---|
| Model Number | 3378QX |
| Dimensions (Main Unit) | 20.5 x 13 x 3 cm |
| Weight | 620 grams |
| Display Type | Color LCD |
| Indoor Temperature Range | -9.9°C to +50°C (14°F to 122°F) |
| Outdoor Temperature Range | -40°C to +70°C (-40°F to 158°F) |
| Humidity Range (Indoor/Outdoor) | 20%RH to 95%RH |
| Wireless Transmission Range | Up to 60 meters (open area) |
| Main Unit Power | DC5V Adapter or 2 x AA Batteries (not included) |
| Outdoor Sensor Power | 2 x AA Batteries (not included) |
| Material | Polycarbonate (PC) |
| Special Features | Large screen, adjustable brightness, wireless connectivity |
10. Warranty and Support
For warranty information and customer support, please refer to the documentation included with your purchase or contact your retailer. Keep your proof of purchase for any warranty claims.

