Provide 5V and 3.3V voltage output; USB to UART (serial data, ISP mode program download /STM series microcontroller), serial data communication (50BPS ~ 2MBPS, can be configured to use unconventional baud rate), ISP mode program download (/STM series microcontroller) ; Suitable For: This module has the function about USB to IIC or I2C, for flashing chip, IIC device control, machine brush. And also can be used separately as master. 20K, 100K, 400K, 750K adjusting communication rate. With LED light status display; Function and voltage switching terminals. Colour:Photo Color Material:plastic+metal Package Contents: 1 x Module 1 x Connecting cable Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.