ThreeH H-AC52Black-Blue
ThreeH Projection Alarm Clock Radio User Manual
Model: H-AC52Black-Blue
1. Introduction
Thank you for purchasing the ThreeH Projection Alarm Clock Radio. This device combines a digital alarm clock with a large mirror display, time projection, FM radio, and a convenient USB charging port. Please read this manual carefully to ensure proper use and to maximize the features of your new alarm clock.
2. Package Contents
- ThreeH Projection Alarm Clock Radio
- USB Power Cable
- User Manual (this document)
3. Setup
3.1 Power Connection
Connect the provided USB power cable to the DC 5V input port on the back of the alarm clock. Plug the other end into a standard USB power adapter (not included) and then into a wall outlet. The display will light up.
3.2 Battery Backup
The alarm clock requires 1 CR5 battery (not included) for memory backup. This battery ensures that time and alarm settings are retained during a power outage. Insert the battery into the battery compartment on the bottom of the unit, observing the correct polarity.
3.3 Initial Time Setting
Upon first power-on or after a power reset without battery backup, the clock may display a default time. To set the time:
- Press and hold the SET button for 3 seconds to enter time setting mode. The hour digits will flash.
- Use the UP or DOWN buttons to adjust the hour.
- Press SET again to confirm the hour and move to minute setting. The minute digits will flash.
- Use the UP or DOWN buttons to adjust the minute.
- Press SET again to confirm the minute and exit time setting mode.
To switch between 12-hour and 24-hour display modes, short press the SET button while in normal time display mode.
4. Operating Instructions
4.1 Display Brightness Adjustment
The 7.5-inch mirror LED screen offers adjustable brightness levels:
- Manual Adjustment: Short press the LIGHT button to cycle through 4 levels: Off, Micro-bright, Medium-bright, and High-bright.
- Automatic Adjustment: The clock can automatically adjust its brightness based on the ambient light. This feature is enabled by default.

4.2 Time Projection Feature
The projection feature allows the time to be displayed on a ceiling or wall in red light. The projection is clear from a distance of up to 5 meters.
- Activate/Deactivate Projection: Short press the PROJECTION button to turn the projection on or off.
- Adjust Projection Angle: The projector can be rotated from -90° to 90° to direct the time display where desired.
- Rotate Projection 180°: Press and hold the PROJECTION button for 3 seconds to flip the projected image 180 degrees, ensuring correct orientation regardless of the clock's position.

4.3 Dual Alarm Function & Snooze
The clock supports setting two independent alarms.
- Setting Alarms: Short press the AL button to select Alarm 1 or Alarm 2. Press and hold the AL button for 3 seconds to enter alarm setup. Use UP or DOWN to adjust the hour and minute, pressing AL to confirm each step.
- Alarm Sound Selection: The alarm can be set to two voices: the traditional 'Didi Didi' sound or the radio. Select your preferred sound during alarm setup.
- Snooze Function: When an alarm sounds, short press the large SNOOZE/LIGHT button (located centrally) to activate snooze for 5 minutes.
- Turn Off Alarm: To turn off an alarm completely, press any button other than the SNOOZE/LIGHT button when the alarm is sounding.

4.4 FM Radio Function
The built-in FM radio allows you to listen to your favorite stations.
- Turn On/Off Radio: Short press the RADIO button to turn the radio on or off.
- Automatic Station Search: Press and hold the RADIO button for 3 seconds to automatically search, lock, and store an unlimited number of stations within the 76-108 MHz range.
- Manual Tuning: Use the UP or DOWN buttons to manually tune to specific frequencies.
- Volume Adjustment: Use the VOL+ or VOL- buttons to adjust the radio volume from 0 to 15 levels.
- Sleep Timer: You can set the radio to automatically turn off after a specified period (5-90 minutes). Press the SLEEP button repeatedly to select the desired sleep timer duration.

4.5 USB Charging Port
The alarm clock is equipped with a USB charging port, allowing you to charge your mobile phone or tablet directly from the clock. Simply connect your device's USB charging cable to the port on the side of the alarm clock.
4.6 Temperature and Humidity Display
The clock displays both temperature and humidity. These readings are shown alongside the time on the main display.
4.7 Mirror Screen Functionality
The large 7.5-inch LED screen also functions as a mirror, providing a convenient reflective surface.

4.8 Product Overview Video
5. Maintenance
- Cleaning: Use a soft, dry cloth to clean the surface of the alarm clock. Do not use abrasive cleaners or solvents, as they may damage the finish.
- Placement: Place the clock on a stable, flat surface away from direct sunlight, heat sources, and excessive moisture.
- Power: Always use the provided USB power cable. Disconnect power during thunderstorms or when not in use for extended periods.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Display is blank or not working. | No power connection; Power outage. | Ensure the USB power cable is securely connected to a working power source. Check if the battery backup is installed correctly. |
| Projection is not visible or dim. | Projection is off; Room is too bright; Incorrect angle. | Short press the PROJECTION button to turn it on. Ensure the room is dark enough. Adjust the projection angle and rotate 180° if needed. |
| Alarm does not sound. | Alarm is not set or deactivated; Volume is too low. | Verify alarm settings and ensure it is activated. Increase the alarm volume. |
| Radio static or poor reception. | Weak signal; Interference. | Adjust the position of the clock to improve reception. Perform an automatic station search again. |
| USB charging not working. | Cable issue; Device not compatible. | Ensure your device's charging cable is functional. Some devices may draw too much power for optimal charging. |
7. Specifications
| Feature | Detail |
|---|---|
| Brand | ThreeH |
| Model Number | H-AC52Black-Blue |
| Display Type | Digital LED (7.5-inch mirror screen) |
| Power Source | Corded Electric (USB DC 5V) |
| Battery Backup | 1 CR5 battery required (not included) |
| Projection | Red light, -90° to 90° adjustable, 180° rotatable |
| Alarm Function | Dual alarms, 5-minute snooze, 2 alarm sounds (Didi Didi, Radio) |
| FM Radio Frequency | 76-108 MHz |
| Radio Volume Levels | 0-15 levels |
| Radio Sleep Timer | 5-90 minutes |
| Brightness Levels | 4 manual levels (Off, Micro, Medium, High) + Auto-adjustment |
| Additional Features | USB charging port, Temperature display, Humidity display |
| Product Dimensions | 0.8"W x 3.5"H (Note: Other dimensions like 7.4''/18.8cm for display length are also relevant, but using the provided 'Product Dimensions' from specs) |
| Material | Plastic, Acrylonitrile Butadiene Styrene |
| Item Weight | 0.25 Kilograms (8.8 ounces) |

8. Warranty and Support
For product support, troubleshooting assistance beyond this manual, or warranty inquiries, please contact ThreeH customer service. Refer to the product packaging or the retailer's website for specific contact information.
A digital version of this user manual may also be available for download from the product's listing page or the manufacturer's website.
Ask a question about this manual
Ask about setup, troubleshooting, compatibility, parts, safety, or missing instructions. Manuals+ will review the question and use this page’s manual context to help answer it.



