Masimo LNCS Neo SpO2 Sensor
Masimo SpO2 Sensor, Pulse Oximetry, medical device. These are used as "single use" and can be worn for several days after initially being attached to a finger with elastic adhesive band. There is a 18 inch cable terminating at a 9 pin connector.
https://professional.masimo.com/products/sensors/lncs/single-use/