TF card jack Benefit: Enables convenient memory expansion and file storage via a TF card for media, documents, or data. Why you need it: Keeps essential content on the device for quick access without external drives. Practical note: Use to store compatible files and access them directly on the device. Screen power control Benefit: Simple, intuitive power management for the display. How it works: Turn off the screen with the home screen key. In the off state, press and hold the key for 3 seconds to turn on the device. In the startup state, hold the key for 3 seconds to turn off. A shutdown confirmation screen is displayed to confirm the action. From any specific function screen, the key can quickly switch back to the main screen. Why you need it: Reduces unnecessary screen use, saves battery, and provides a clear way to navigate back to the main interface. Display Benefit: Display includes a digital charging indicator for clear power status. Why you need it: See charging information at a glance to manage power and usage effectively. USB charging port Benefit: USB charging port provides a power source for charging devices or powering the unit via USB. Why you need it: Convenient charging options when you are on the go or when a USB power source is available. Use scenarios Incar or travel use: Store media and important files on a TF card, manage screen power to extend battery life during long trips, and use the USB port to charge a phone or other USBpowered device. Outdoor or field use: Keep essential data on a TF card for quick access, switch quickly to the main screen for operations, and monitor charging status with the digital display to ensure the device remains powered. Home or workspace setup: Use the TF card jack for local storage of files, rely on the easy screen controls for quick navigation, and charge connected devices via the USB port as needed.