This is an USB - RS232 TTL converter dedicated to TEC controller 7-15V 0-8A. This converter is using CH340G chip.
GND; TXD; RXD; VCC; 5V; 3,3V
Using this device it is possible to connect PC with the TEC controller to read/write* data from it.
*NOTE: Parameters of the controller can be read in both - basic and advanced version of controller, when changing parameters is possible only in advanced version of the TEC controller.