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It measures the saturation of oxygen in the blood and also your pulse rate
Make sure to get an oximeter to view these easily
-Nylon braided material
Control music playback and answer calls on the fly with buttons and microphone placed conveniently on the earcup
-Can also be used for keyboard
RCA Professional Wireless Microphone with Receiver Pair RM200 TV Antenna It measures the saturation ofWireless Receiver: Power LED Light Radio Frequency Diversity light Volume Telescoping antenna: to receive the signal from the transmitter Separated audio output A (6. 35mm connector) Mixed audio output A+B (6. 35mm connector) Power Input connector: Connect to AC 12 V200mA power adapterHandheld Microphone Transmitter: Power button Power LED light Color IC rings Battery compartment Anti roll ring Battery cover