NulSom Inc. Ultra Compact RS232 to TTL Converter with Male DB9 and Hood Kit (3.3V to 5V) Male DB9 Connector (NS-RS232-02: B00OPU2QJ4) Includes a plastic DB9 Hood Kit Ultra compact board size: 15 x 14 mm, FCC Certified Supports 3V to 5.5V power supply (***The Rx/Tx logic level is equal to the Vcc-supply.*** Vcc: 3.3V -&gt; Rx/Tx High Logic Level: 3.3V. Vcc: 5V -&gt; Rx/Tx: 5V ) 4 pin through hole: VCC, GND, Logic out (TX), Logic In (RX) and 2 pin through hole: CTS, RTS