Supports 3V to 5.5V power supply (***The Rx/Tx logic level is equal to the Vcc-supply.*** Vcc: 3.3V -> Rx/Tx High Logic Level: 3.3V. Vcc: 5V -> Rx/Tx: 5V )
Includes SP3232E
4 pin through hole: VCC, GND, Logic out (TX), Logic In (RX) and 2 pin through hole: CTS, RTS