User's Manual

 Power button: short press to realize sleep / wake function
 Press and hold for 10 seconds to realize the forced shutdown function
 Volume ➕ key: short press to increase volume
 Volume ➖ key: short press to realize volume down function
 Confirm key: short press to realize the confirmation function
 Back key: short press to rea lize the return function
 MENU key: short press to realize the MENU function, such as recalling volume,
brightness adjustment and other optional functions
 Up / Down / Left / Right key: Short press to realize Up / Down / Left / Right function
4.2. Interface Description

 Support external 3.5mm standard headphones
 Support external TF card
 Support TypeC interface USB function
 Support MIC function
4.3. Description of parts