Introduction
The Trevi SLD 3850 is a digital alarm clock designed to provide accurate timekeeping, alarm functions, and environmental monitoring. It features a large, backlit LED display for clear visibility, an integrated digital thermometer to show room temperature, and a multilingual calendar. This manual provides detailed instructions for setting up, operating, and maintaining your device.

Image: Front view of the Trevi SLD 3850 Digital Alarm Clock, showing the time, date, and temperature on its blue backlit display.
Safety Information
- Do not expose the device to extreme temperatures, direct sunlight, or high humidity.
- Avoid dropping the device or subjecting it to strong impacts.
- Keep the device away from water and other liquids.
- Do not attempt to disassemble or repair the device yourself. Refer to qualified service personnel.
- Dispose of used batteries responsibly according to local regulations.
Package Contents
Please check the package for the following items:
- Trevi SLD 3850 Digital Alarm Clock
- User Manual (this document)
Note: AAA batteries are not included and must be purchased separately.
Setup
1. Battery Installation
- Locate the battery compartment cover on the back of the alarm clock.
- Slide or unclip the cover to open it.
- Insert two (2) AAA batteries, ensuring the correct polarity (+ and -) as indicated inside the compartment.
- Replace the battery compartment cover securely.

Image: Side view of the alarm clock, illustrating the location of control buttons, which are typically used for setting time and alarms.
2. Initial Power-On
Upon inserting the batteries, the display will illuminate, and the clock will typically show a default time or begin flashing. You can now proceed to set the time and other functions.
Operating Instructions
1. Setting the Time
- Press and hold the 'SET' button (or similar button, refer to device markings) until the time display starts flashing.
- Use the 'UP' and 'DOWN' buttons (or '+' and '-' buttons) to adjust the hours.
- Press 'SET' again to move to minutes, then adjust using 'UP'/'DOWN' buttons.
- Continue pressing 'SET' to cycle through other settings like 12/24 hour format, year, month, and day. Adjust each setting as needed.
- Press 'SET' one last time or wait a few seconds for the settings to be saved and the display to return to normal timekeeping.
2. Setting the Alarm
- Press the 'ALARM' button (or similar) once to display the current alarm time.
- Press and hold the 'ALARM' button until the alarm time starts flashing.
- Use the 'UP' and 'DOWN' buttons to set the desired alarm hour.
- Press 'ALARM' again to move to minutes, then adjust using 'UP'/'DOWN' buttons.
- Press 'ALARM' one last time or wait for the settings to be saved.
- To activate/deactivate the alarm, press the 'ALARM ON/OFF' button (or similar). An alarm icon will appear on the display when activated.
3. Using the Snooze Function
When the alarm sounds, press the 'SNOOZE' button (usually a large button on top) to temporarily silence the alarm. The alarm will sound again after a few minutes (typically 5-10 minutes, depending on the model). To turn off the alarm completely, press any other button or let it ring until it automatically stops.
4. Displaying Temperature and Calendar
The Trevi SLD 3850 continuously displays the current room temperature and the date (day, month, and day of the week) on its screen. No specific action is required to view these features.
5. Backlight Operation
The large LED display features a backlight for improved visibility in low-light conditions. The backlight may activate automatically when a button is pressed or can be toggled via a dedicated 'LIGHT' button if available.

Image: An elevated view of the Trevi SLD 3850 Digital Alarm Clock, highlighting the top buttons for snooze and settings.
Maintenance
1. Cleaning
To clean the device, use a soft, dry cloth. Do not use abrasive cleaners, solvents, or chemical sprays, as these can damage the casing or display.
2. Battery Replacement
When the display dims or functions become erratic, it is time to replace the batteries. Follow the battery installation steps outlined in the 'Setup' section. Always replace both batteries at the same time with new ones of the same type (AAA).
Troubleshooting
- Display is blank or dim: Check if batteries are inserted correctly and are not depleted. Replace batteries if necessary.
- Alarm does not sound: Ensure the alarm function is activated (check for the alarm icon on the display). Verify the alarm time is set correctly.
- Time is inaccurate: While the clock is generally precise, occasional minor adjustments may be needed. Reset the time as per the 'Setting the Time' instructions. Ensure the clock is not exposed to strong magnetic fields.
- Buttons are unresponsive: Remove and reinsert batteries to perform a soft reset. If the issue persists, contact customer support.
Specifications
| Model Number | SLD 3850 |
| Product Dimensions | 10 x 3.81 x 3 cm |
| Item Weight | 50 Grams |
| Power Source | Battery Powered (2 x AAA, not included) |
| Display Type | Digital LED with Backlight |
| Special Features | Alarm, Calendar Display, Snooze, Integrated Thermometer |
| Color | Black |
| Frame Material | Acrylonitrile Butadiene Styrene |
Warranty and Support
This product is covered by a standard manufacturer's warranty. For detailed warranty information, please refer to the documentation provided with your purchase or visit the official Trevi website. For technical support, troubleshooting assistance, or service inquiries, please contact Trevi customer service through their official channels.
You can often find support contact information on the manufacturer's website or on the product packaging.





