This module is an isolated USB-TTL. The interface used is the common TYPE-C interface. Insert the TYPE-C data cable to connect to the computer. Signal sampling is a dedicated signal isolation chip, making the output more stable. The power indicator light and humidity module are clearer. 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, not limited by protocol Baud rate: up to 25600bps Isolation level: power isolation and signal isolation, isolation voltage AC300oVrms, static 8KV Temperature range: -40-80 Supported systems: supports hot swap, supports win98//2000/2003/2008/XP/WIN7/WIN8/WIN10/VISTA/LINUX/OSX systems, 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 supply TYPE-C: USB interface to computer Note: The 3.3V pins on the TTL end are not the module's output voltage. This pin needs to power the module. There is a power indicator light. The power indicator light must be on to work. Color: Black Material: PCB+electronic components Package content: 1 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 to be slightly different from the real one. The allowed measurement error is +/- 1-3 cm.