3ft DB9 to 3.5mm serial control cable enables configuration and calibration of a 3.5mm serial device requiring 3-conductor RS-232 serial remote control using a 3.5mm audio jack - High quality 28 AWG copper wires with Al-Mylar cable shielding and shielded metal shell connectors help prevent EMI interference - Works with computers that are equipped with a DB9 9pin serial port - 3ft (1m) DB9 Male to 3.5 mm Male Serial Cable Color: Black AWG: 28 OD: 3.5mm Jacket: PVC.