This module is an isolated USB-TTL. The interface used is the mainstream TYPE-C interface. Insert the TYPE-C data cable to connect to the computer. The signal sampling is a dedicated signal isolation chip, which makes the output more stable. The power indicator light and the humidity module are more clear. USB power supply: USB 5V, TYPE-C interface TTL terminal power supply: 3.3V, with power indicator TTL end signal level: 3.3V (TTL end only supports 3.3V power supply and 3.3V TTL signal, not 5V!) Communication protocol: pure hardware equipment, not restricted by protocol Baud rate: up to 25600bps Isolation level: power isolation and signal isolation, isolation voltage AC300oVrms, static ±8KV Temperature range: -40℃-80℃ Support system: support hot swap, support win98/CE/2000/2003/2008/XP/WIN7/WIN8/WIN10/VISTA/- LINUX/ OSX system, USB interface is hot-swappable Product size: 23mm x 23mm x 7mm Interface 3.3V: 3.3V output positive RX: UART serial port input TX: UART serial port output GND: negative pole of power output TYPE-C: USB interface to computer Note: The 3.3V pin on the TTL end is not the output voltage of the module. This pin needs to supply power to the module. There is a power indicator light. The power indicator light must be on to work. Colour:Black Material:PCB+electronic components Package Contents: 2 x USB to TTL Module 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.