Features: This board adopts 6Pin interface,spacing 2.54mm. Made pf high quality selected mateial. has a long service life. Consistent with the power supply of the conversion chip,voltage can be input from outside It can also be used as an output to supply power to the outside world. USB power supply,3.3V,TTL by 3.3V level,Fit3.3V TTL system,It can be provided to the outside world.3.3V Voltage,Initial factory-based configuration;5V TTL by 5V level,Fit5V TTL system,It can be provided to the outside world.5V Voltage. Package Includes: 1 X YS CH341T Module Specifications: Type:YS CH341T Module / USB to 12C Module Size: approx 5.5X1.5cm/2.17X 0..59in Material: Metal+Plastic RXI,TXO,GND,VCC,SDA,SCL (The corresponding position on the panel has been marked.) The definition is as follows: RXI: input,TTLSerial Received Signal(meetMCUOfTX); TXO:output,TTLSerial Port Sending Signal(meetMCUOfRX); GND: Signally; VCC:System Power Supply, SDA:I2CBus Serial Data(Integrated pull-up resistance,No need to pull up outside); SCL:I2CBus Serial Clock(Integrated pull-up resistance,No need to pull up outside). USB2IICfunction:meetSCL SDA GND,VCCNo answer; USB2TTLfunction:meetRXI TXO GND, VCCNo answer; note: Due to the problems of lighting effects and shooting angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment.