Innovo SnugFit probe compatible with CMS 50F & CMS 50FW (Might come in Black or White) Newly improved Innovo SnugFit probe designed to provide ultimate comfort for your finger during prolong use. The probe contains next generational LED light and sensor capable of measuring SpO2 and Pulse Rate (PR) at low blood perfusion with extreme precision. It is also made up of infra-red absorbing material that can absorb ambient infra-red 97% better than the previous Contec probe to reduce background interference and increase signal to noise ratio. The tensile strength has also been increased slightly to ensure a tighter fit to the finger during prolong use without restricting blood flow. These improvements allow the Acc U Rate SnugFit probe to provide a much more reliable and superior experience compared to the previous Contec probe. You are buying only the probe. Does not come with the wrist pulse oximeter! Will work with any CMS 50F and Bluetooth enabled CMS 50F that contains a mini-USB port