Support 4 kinds of TTL levels:This is a versatile USB to TTL converter. It is powerful enough to handle almost all TTL level communications. It is compatible with 5V, 3.3V, 2.5V, 1.8V TTL levels.FTDI FT232RNL Chip:Built-in original FTDI FT232RNL Chip.Industrial grade, Compatible with Windows 7, 8, 10, 11, Linux, MacOSProtective case:Comes with a protective case, this transparent protective case can effectively prevent static interference from the hand and prevent accidental short circuitIt provides access not only to UART TX,RX, RTS, CTS, VCC and GND pins,but also provides access to DSR,RI,DCD,DTR,RESET pins