A SY7201ABC constant current source chip then converts the PWM signal into a constant current to drive the screen backlight. 
The Taishanpai device also has TTL contacts, enabling direct data communication with the computer via a USB-to-TTL converter. 
The lithium battery management circuit 
converting 5V USB voltage or 4.2V battery voltage to 12V to power the Taishanpai device. 
product demonstration shown. )
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