1. Product Overview
The DACHAN Smart LED Curtain Lights are versatile, app-controlled string lights designed for both indoor and outdoor decoration. Featuring 400 RGB LEDs, these lights offer dynamic patterns, music synchronization, and customizable DIY displays to enhance any occasion.


2. Specifications
| Feature | Description |
|---|---|
| Color | RGB (16 Million Colors) |
| LED Quantity | 400 LEDs |
| Dimensions (approx.) | 2x2 meters (6.6x6.6 ft) or 3x3 meters (9.8x9.8 ft) |
| Power Supply | USB |
| Input Voltage | DC 5V (Nominal Voltage 4.5V) |
| Control Method | Remote Control, App Control, Control Box |
| Working Temperature | -20°C to 50°C |
| Luminous Flux | 60-249 lumens |
| Lighting Distance | 1-5 meters |
| Head Number | > 200 |
| Dimmable | Yes |
| Bulb Shape Size | SMD |
| Light Source | LED bulbs |
| Bulbs Included | Yes |
| Smart Device | Yes |
| Remote Control Battery Type | Button Cell (not included for main unit) |
| Waterproof Rating | IP65 (Curtain Lights), IP44 (LEDs - protect connections from rain) |
| Certifications | RoHS, FCC, CE (FCC ID: 2AKBP-BSL2) |
| Package Dimensions | Length: 19cm, Width: 12cm, Height: 10cm |
| Package Weight | 0.474 kg |
3. Setup Instructions
3.1 Package Contents

3.2 Installation Diagram

Hang the curtain lights in your desired location. Ensure the USB power cable can reach a power source.
3.3 Power Connection
- Plug the USB connector into a compatible 5V USB power source (e.g., power bank, computer USB port, USB wall adapter).
- Turn on the string light switch located on the control box.
3.4 Mobile App Connection
- Download the 'Hello Fairy' app from the iOS App Store or Google Play Store, or scan the QR code provided in the manual.
- Enable Bluetooth on your mobile phone.
- Open the 'Hello Fairy' app. It will automatically search for devices.
- Once 'Hello Fairy-xxxx' appears on the interface, tap it to connect and enter the main control interface.

3.5 Remote Control Preparation
The IR Remote Controller uses a button cell battery. Before first use, pull out the plastic tab from the bottom of the remote to activate the battery.
4. Operating Instructions
4.1 Control Box Functions
The physical control box attached to the lights has the following functions:
- Quick Double-Click: Controls On/Off of the string light.
- Long Press (3 seconds): Cycles through colored light, music, and scene modes in sequence.
- Single Click (in Colored Light Mode): Switches to the next color.
- Single Click (in Music Mode): Switches to the next music rhythm mode.
- Single Click (in Scene Mode): Switches to the next scene.
4.2 IR Remote Controller (24 KEY)

Ensure the IR remote aims at the IR receiver on the control box within a sensing distance of 5 meters and an angle of 120 degrees.
- 1. ON/OFF: Power button.
- 2. Pause/Run Button: Play/Pause current effect.
- 3. LED Brightness Adjustment (+/-): Adjusts the light intensity.
- 4. Shift Up/Down/Left/Right/Flash/Solid: Controls various pattern movements and effects.
- 5. Music Modes: Cycles through different music synchronization effects.
- 6. Timing Function: Sets a timer (e.g., 4 hours on, off until tomorrow).
- 7. Theme Scenes Buttons: Accesses 9 pre-set theme scenes.
- 8. Color/Scene Cycle: In static monochrome mode, cycles through 15 colors. In dynamic mode, cycles through 20 modes.
4.3 Mobile App Control ('Hello Fairy')
The 'Hello Fairy' app provides comprehensive control over your curtain lights.
- Rename Device: Click the device name and swipe left to quickly rename it.
- Pattern & Text Displays: Customize your own lighting shows by creating text, uploading GIFs, or pictures.
- Music Sync Mode: Lights dance to the rhythm of your favorite playlist.
- Multiple Dynamic Scene Modes: Choose from various pre-set patterns for different occasions (Halloween, Christmas, Easter, Birthday).
- Schedule & Timer: Set specific times for the lights to turn on or off.




Video demonstrating app control of patterns and colors.
5. Maintenance
5.1 General Care
- To prevent static electricity, handle the product carefully during installation and use.
- Avoid using sharp objects that could damage the lights.
- Keep the lights away from strong chemicals such as strong acids and alkalis.
- For outdoor use, ensure the USB connection point is protected from rain and moisture, as the LEDs themselves are rated IP44, while the overall product is IP65.
5.2 Remote Control Battery
The remote control uses a button cell battery. If the remote stops responding, replace the battery. Ensure the new battery is installed correctly according to polarity.
WARNING: Button Cell Battery Ingestion Hazard
This product contains a button cell or coin battery. Ingestion can cause severe injury or death. A swallowed button cell or coin battery can cause internal chemical burns in as little as 2 hours.
KEEP new and used batteries OUT OF REACH OF CHILDREN.
Seek immediate medical attention if a battery is suspected to be swallowed or inserted inside any part of the body.
Requirements for Consumer Products Containing Button Cell or Coin Batteries:
- Remove and immediately recycle or dispose of used batteries according to local regulations and keep away from children. Do NOT dispose of batteries in household trash or incinerate.
- Even used batteries may cause severe injury or death.
- Call a local poison control center for treatment information.
- Always completely secure the battery compartment. If the battery compartment does not close securely, stop using the product, remove the batteries, and keep them away from children.
6. Troubleshooting
- Lights not turning on: Check the USB power connection and ensure the control box switch is in the ON position. If the cable appears damaged, it may need repair or replacement.
- Remote control not working: Ensure the plastic tab has been removed from the battery compartment. Check if the battery needs replacement. Make sure the remote is aimed directly at the control box's IR receiver.
- Infrared interference with TV remote: If the light string's infrared signal conflicts with your TV remote, you can choose to use either the app control or reposition the IR receiver.
- App connection issues: Ensure Bluetooth is enabled on your phone and the 'Hello Fairy' app has necessary permissions. Restart the app and try reconnecting.
- Inconsistent patterns/images: Some users have reported patterns occasionally disappearing or behaving erratically. Try restarting the lights or the app. For complex patterns, ensure sufficient lighting density (e.g., by linking multiple units).
- Incompatible apps/models: If you have multiple units, ensure they are of the same model and use the same app for consistent control. Different models may require different apps.
7. Warranty and Support
This product comes with a one-year warranty from the date of purchase. For any questions or issues, please contact the seller or manufacturer for support.
For additional guidance, you may refer to the official user manual PDF: User Manual (PDF)
7.1 FCC Statement
This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) This device must accept any interference received, including interference that may cause undesired operation.
RF Exposure Information: The device has been evaluated to meet general RF exposure requirements. The device can be used in portable exposure conditions without restriction.
8. User Tips
- Enhanced Animations: For a more spectacular display and to create larger, more complex animations, consider purchasing and linking multiple units of the curtain lights. The software allows for synchronized control of up to 8 sets.
- Placement Considerations: While versatile, consider the size of the lights (e.g., 2x2m or 3x3m) when planning placement. They might be too large for smaller windows but ideal for balconies or larger wall spaces.
- Outdoor Use Precaution: Although rated IP65 waterproof, the individual LEDs are rated IP44. For prolonged outdoor use, especially in wet conditions, ensure all connections (especially the USB power input) are adequately protected from direct rain and moisture.
9. Frequently Asked Questions (FAQ)
- Q: Is the product waterproof?
- A: The overall product has an IP65 waterproof rating, suitable for outdoor and indoor decor. However, the LEDs themselves are rated IP44. For outdoor use, it is recommended to protect the USB connections from direct rain.
- Q: Does it have different Christmas patterns?
- A: Yes, the lights feature multiple dynamic scene modes and patterns, including themes suitable for Christmas, Halloween, Easter, and birthdays.
- Q: Can I write my own text or display custom graphics?
- A: Yes, the 'Hello Fairy' app supports DIY Pattern & Text Displays, allowing you to customize your own lighting shows with text, uploaded GIFs, or pictures.
- Q: What is the size of the curtain lights?
- A: The lights are available in approximately 2x2 meters (6.6x6.6 ft) and 3x3 meters (9.8x9.8 ft) configurations, both featuring 400 LEDs. The difference in size means the LEDs are more spaced apart in the larger model.
- Q: What type of battery does the remote control use?
- A: The remote control uses a button cell battery. A specific model number is not provided, but CR2032 is a common type for such remotes.