This direct-connect spO2 sensor is available for use with Beijing Choice Electronic: MMED6000DP; MedChoice: M12, M7; Osen: 9000; PaceTech: The SpO2 connector for these Pace Tech monitors are usually identified with a blue/green ring around the connector, Tranquility II, Version 2 monitors with touch-screen technology, Vitalmax 4000.