1. Product Overview
The Artlii Play4 Smart Projector is an advanced home entertainment device integrating an Android TV 10 system, offering native 1080P resolution with 4K support, autofocus, and auto keystone correction. It features 5G WiFi, Bluetooth connectivity, and built-in Chromecast for a versatile viewing experience.

Figure 1: Front view of the Artlii Play4 Smart Projector, showcasing its compact design and lens.
Video 1: An official product video demonstrating the key features and usage scenarios of the Artlii Play4 Smart Projector, including its native 1080P display, Chromecast functionality, and auto-focus/keystone correction.
2. Setup Guide
2.1 What's in the Box
- ATV Dongle
- Power adapter
- Remote Control (Batteries not included)
- HDMI Cable
- Lens cover
- Instructions Manual
- Cleaning tools
2.2 Initial Setup
- Power Connection: Connect the power adapter to the projector's power input and then to a power outlet.
- ATV Dongle Installation: Insert the provided ATV Dongle into the designated slot on the projector. This enables the Android TV system.
- Placement: Place the projector on a stable, flat surface, ensuring the lens is unobstructed and facing the projection surface (wall or screen).
- Power On: Press the power button on the projector or the remote control to turn on the device.
- Initial Focus & Keystone: The projector features automatic focus and keystone correction. Allow a few seconds for the image to adjust. Manual adjustments can be made via the settings menu if needed.
- Network Connection: Navigate to the settings menu to connect the projector to your 5G or 2.4G WiFi network.
- Google Account Setup: Follow the on-screen prompts to log in with your Google account to access Android TV features and download apps.

Figure 2: Rear view of the Artlii Play4 Smart Projector, showing various input and output ports including HDMI and USB.
3. Operating Instructions
3.1 Android TV System
The integrated Android TV 10 system provides access to a wide range of streaming services and applications. Use the remote control to navigate the interface, search for content, and manage your apps.

Figure 3: The Android TV 10 home screen displayed by the projector, showing various streaming app icons like Netflix, Prime Video, and YouTube.
3.2 Autofocus and Auto Keystone Correction
The Artlii Play4 features advanced autofocus and auto keystone correction. Upon startup or movement, the projector will automatically adjust the image for optimal clarity and geometric accuracy. If manual adjustment is preferred, these settings can be found in the projector's display settings menu.

Figure 4: Visual representation of the projector's autofocus and auto keystone correction features, showing how the image automatically adjusts for clarity and shape.
3.3 Chromecast Functionality
With built-in Chromecast, you can easily cast content from your compatible smartphone, tablet, or laptop directly to the projector. Ensure your device and the projector are connected to the same WiFi network.

Figure 5: An illustration of the Chromecast feature, demonstrating how content from a mobile phone can be wirelessly projected onto a larger screen via the Artlii Play4.
3.4 Bluetooth Connectivity
The projector supports Bluetooth connectivity, allowing you to pair external audio devices such as headphones, speakers, or soundbars for enhanced audio experience. Navigate to the Bluetooth settings in the Android TV menu to pair your devices.

Figure 6: The projector connected wirelessly to various Bluetooth audio devices, such as headphones and a portable speaker, highlighting its audio output flexibility.
3.5 External Device Connection
The projector is equipped with multiple ports for connecting external devices:
- HDMI Ports: Connect gaming consoles, Blu-ray players, laptops, or other HDMI-enabled devices.
- USB Ports: Play media files directly from USB drives or connect USB peripherals.
- Audio Out: Connect wired headphones or external speakers.
4. Maintenance
4.1 Cleaning the Lens
Use a soft, lint-free cloth specifically designed for optical lenses to gently wipe the projector lens. Avoid using abrasive cleaners or cloths that could scratch the lens surface.
4.2 Cleaning the Projector Body
Wipe the exterior of the projector with a soft, dry cloth. Do not use liquid cleaners or solvents, as they may damage the finish.
4.3 Ventilation
Ensure the projector's ventilation openings are clear and unobstructed to prevent overheating. Do not place the projector on soft surfaces that could block airflow.
5. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| No image projected | Power cable disconnected; Projector off; Input source incorrect. | Check power connection; Turn on projector; Select correct input source. |
| Image blurry | Out of focus; Lens dirty. | Allow autofocus to run or manually adjust focus; Clean the lens. |
| No sound | Volume too low; External audio device not connected/paired; Muted. | Increase volume; Check Bluetooth connection or audio cable; Unmute. |
| Cannot connect to WiFi | Incorrect password; Router issues; Out of range. | Verify password; Restart router; Move projector closer to router. |
6. Technical Specifications
| Feature | Specification |
|---|---|
| Brand | ARTlii |
| Model Number | YG721 |
| Item Weight | 5.22 pounds |
| Product Dimensions | 11.57 x 3.89 x 8.81 inches |
| Color | Gray |
| Display Resolution | 1920 x 1080 (Native 1080P, 4K Supported) |
| Connectivity Technology | Bluetooth, Wi-Fi (2.4G/5G Dual-band) |
| Special Features | Wireless, Portable, Built-In Wi-Fi, Auto Focus, Auto Keystone |
| Speaker Type | Soundbar (Dual 5W Built-in Speakers) |
7. Warranty and Support
ARTlii is committed to optimizing product quality and enhancing user experience. For detailed warranty information and technical support, please refer to the official ARTlii website or contact their customer service directly.
A digital version of this user manual is available for download: User Manual (PDF)





