1. Introduction
This manual provides detailed instructions for the MENTUME K90 Android 16 Tablet. It covers setup, operation, maintenance, and troubleshooting to ensure optimal performance and user experience. Please read this manual thoroughly before using your device.

Figure 1.1: MENTUME K90 Android 16 Tablet
2. What's in the Box
Verify that all items are present in the package:
- 1 Tablet
- 1 Charger
- 1 Charging Cable
- 1 Protective Cover
- 1 Bluetooth Keyboard
- 1 Wireless Mouse
- 1 Stylus
- 1 User Manual (this document)

Figure 2.1: Package Contents
3. Product Overview
3.1 Tablet Components
Familiarize yourself with the tablet's physical features and ports.

Figure 3.1: Tablet Ports and Buttons (Example)
- Power Button: Press and hold to power on/off or restart.
- Volume Buttons: Adjust audio volume.
- USB-C Port: For charging and data transfer.
- 3.5mm Headphone Jack: Connect headphones or external speakers.
- MicroSD Card Slot: Expand storage up to 1TB.
- Front Camera (8MP): For video calls and selfies.
- Rear Camera (20MP): For high-resolution photos and videos.
- Dual Stereo Speakers: Provide enhanced audio output.
4. Setup
4.1 Initial Power On and Charging
- Connect the tablet to the charger using the provided USB-C cable.
- Allow the tablet to charge for at least 30 minutes before first use, or until the battery indicator shows sufficient charge.
- Press and hold the Power Button until the MENTUME logo appears.
- Follow the on-screen prompts to complete the initial setup, including language selection, Wi-Fi connection, and Google account login.
4.2 Connecting Accessories
The tablet comes with a protective cover, Bluetooth keyboard, wireless mouse, and stylus for enhanced productivity.

Figure 4.1: Tablet with Keyboard and Stylus Setup
4.2.1 Bluetooth Keyboard
- Ensure the keyboard is charged and powered on.
- On your tablet, go to Settings > Connected devices > Bluetooth.
- Turn on Bluetooth and scan for devices.
- Select the keyboard from the list of available devices and follow any pairing instructions.
4.2.2 Wireless Mouse
- Insert the USB receiver (usually found in the mouse's battery compartment) into the tablet's USB-C port using an OTG adapter if necessary (adapter not included).
- Ensure the mouse has batteries and is powered on. The tablet should automatically detect the mouse.
4.2.3 Stylus
The stylus does not require pairing. Simply use it for precise input on the touchscreen.
4.3 Network Connection
4.3.1 Wi-Fi Connection
- Go to Settings > Network & internet > Wi-Fi.
- Turn on Wi-Fi.
- Select your desired network from the list and enter the password if prompted.
4.3.2 Bluetooth Connection
For connecting other Bluetooth devices (e.g., headphones), follow the same steps as for the Bluetooth keyboard.

Figure 4.2: Wireless Connectivity
4.4 Storage Expansion
The tablet supports MicroSD cards up to 1TB for additional storage.
- Locate the MicroSD card slot on the side of the tablet.
- Carefully insert the MicroSD card into the slot until it clicks into place.
- The tablet will prompt you to format the card for use. Follow the on-screen instructions.

Figure 4.3: Storage Options
5. Operating Instructions
5.1 Android 16 Operating System
The tablet runs on the latest Android 16 operating system, offering a fluid, secure, and stable user experience with enhanced privacy features.

Figure 5.1: Android 16 OS Interface
5.1.1 Gemini AI Integration
The integrated Gemini AI provides intelligent voice support, efficient office assistance, and practical life services. Access Gemini AI through its dedicated app or by voice command (if configured).

Figure 5.2: Gemini AI Capabilities
5.2 Display Usage
The 12-inch HD display with 2000x1200 resolution and a 90Hz refresh rate offers a smooth and immersive visual experience.
- Brightness Adjustment: Swipe down from the top of the screen to access quick settings and adjust brightness.
- Screen Rotation: Enable or disable auto-rotate in quick settings or display settings.
- Widevine L1 Support: Enjoy high-definition streaming content from supported platforms.

Figure 5.3: Immersive Display

Figure 5.4: Widevine L1 Streaming Capability
5.3 Camera Operation
The tablet features an 8MP front camera and a 20MP rear camera for capturing photos and videos.
- Open the Camera application.
- Switch between front and rear cameras using the camera icon.
- Tap the shutter button to take a photo or start/stop video recording.
- Adjust settings like flash, timer, and mode within the camera app.
5.4 Audio and Multimedia
The tablet is equipped with dual stereo speakers for a rich audio experience. Connect headphones via the 3.5mm jack or Bluetooth for private listening.

Figure 5.5: Dual Stereo Speakers
5.5 Biometric Identification (Face Recognition)
Unlock your tablet securely using face recognition.
- Go to Settings > Security & privacy > Face unlock.
- Follow the on-screen instructions to register your face.
- Ensure good lighting conditions when setting up and using face recognition.
6. Maintenance
6.1 Cleaning Your Tablet
- Use a soft, lint-free cloth to clean the screen and body of the tablet.
- Do not use abrasive cleaners, alcohol, or solvents, as these can damage the surface.
- Avoid getting moisture into openings.
6.2 Battery Care
The tablet has a 9000 mAh battery. To prolong battery life:
- Avoid extreme temperatures.
- Do not let the battery drain completely regularly.
- Use the provided charger and cable.
- If storing the tablet for an extended period, charge it to about 50% and power it off.

Figure 6.1: Battery Performance
6.3 Software Updates
Regularly check for and install software updates to ensure your tablet has the latest features, security patches, and performance improvements.
- Go to Settings > System > System update.
- Follow the on-screen instructions to check for and install updates.
7. Troubleshooting
This section addresses common issues you might encounter with your tablet.
7.1 Tablet Not Turning On
- Ensure the battery is charged. Connect the charger and wait a few minutes before attempting to power on.
- Press and hold the Power Button for at least 10-15 seconds to force a restart.
7.2 Wi-Fi Connection Issues
- Check if Wi-Fi is enabled in Settings.
- Restart your Wi-Fi router.
- Forget the network in tablet settings and reconnect.
- Ensure you are within range of the Wi-Fi signal.
7.3 Accessories Not Connecting
- Bluetooth Keyboard/Mouse: Ensure they are charged, powered on, and in pairing mode. Re-attempt pairing via Bluetooth settings.
- Wireless Mouse (USB): Ensure the USB receiver is properly inserted and the mouse has power.
7.4 Slow Performance
- Close unnecessary background applications.
- Clear cache for frequently used apps.
- Ensure sufficient storage space is available. Uninstall unused apps or move files to the MicroSD card.
- Restart the tablet.
8. Specifications
| Feature | Detail |
|---|---|
| Brand | MENTUME |
| Model Name | K90 |
| Operating System | Android 16 |
| Processor | Unisoc T7250 Octa-Core (Max 1.8 GHz) |
| RAM | 36 GB (12 GB installed + 24 GB virtual) |
| Internal Storage | 256 GB |
| Expandable Storage | Up to 1 TB (MicroSD) |
| Screen Size | 12 Inches |
| Display Resolution | 2000 x 1200 Pixels (IPS) |
| Refresh Rate | 90 Hz |
| Rear Camera | 20 MP |
| Front Camera | 8 MP |
| Battery Capacity | 9000 mAh (Lithium Polymer) |
| Wireless Technology | Wi-Fi (802.11a/b/g/n/ac), Bluetooth 5.0 |
| Connectivity | USB-C, 3.5mm Audio Jack |
| Special Features | Stereo Speakers, Expandable Memory, USB OTG, Stylus Support, GPS, Face Recognition |
| Item Weight | 1.43 Kilograms |
| Item Dimensions (L x W x T) | 24.7 x 16.3 x 1.1 cm |
| Included Components | Tablet, Charger, Charging Cable, Cover, Keyboard, Mouse, Stylus, Manual |
9. Warranty Information
The MENTUME K90 Tablet comes with a 1-year limited product warranty from the date of purchase. This warranty covers manufacturing defects and workmanship under normal use. It does not cover damage caused by misuse, accidents, unauthorized modifications, or normal wear and tear.
Please retain your proof of purchase for warranty claims.
10. Support
For further assistance, technical support, or warranty inquiries, please contact MENTUME customer service through the retailer where you purchased the product or refer to the official MENTUME website for contact information.
Please have your model number (K90) and proof of purchase ready when contacting support.