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1.Product characters: 1)Use the light-emitting encoder, press the bright blue light, if not, it will not light, Full of technology; 2)TFT touch screen mode:serial port screen RS232 port; 3)2 sets of UART serial port extension ports are reserved for DIY use. 2.Product Parameters: Appearance size:93*87mm Installation size:Perfectly replace the original LCD screen of Ender3 printer,detail information please check TFT35-E3 V3.0 SIZE Microprocessor:STM32F207VCT6 Power Input:DC 5V SD card logic voltage:3.3V and 5V(Such as: support MEGA2560 main control chip motherboard, higher compatibility) Notes 1. When using 12864 screen mode, connect the port EXP1 and EXP2 to the motherboard. There is no touch function in this mode. 2. When using serial port screen mode, connect with TFT or AUX-1 on the motherboard via RS232. This mode has touch function; 3. Two work modes can be changed by one key. Press the encoder about 3 seconds until the mode selection page appears, then press the encoder after selecting the mode.