Female & Male Combo - Ultra Compact RS232 to TTL Converter Female & Male Combo (DB9 Connector, 3.3V to 5V) Female type converter (NS-RS232-01: B00OPTOKI0) and Male type converter (NS-RS232-02: B00OPU2QJ4) Combo Package Ultra compact board size:15 x 14 mm, DB9 Connector 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 ) Includes SP3232E, FCC Certified 4 pin through hole: GND, Logic out (TX), Logic In (RX), VCC (3V to 5.5v) and 2 pin through hole: CTS, RTS