ITEM NAME:MAX30102 Oximeter Heart Rate Beat Pulse Sensor 1.8V-3.3V Replace MAX30100 FT.1 x Low Power MAX30102 Heart Rate Oxygen Pulse Breakout. Highly-integrated, small-size sensor. Tiny 12.7mm x 12.7mm (0.5in x 0.5in) Board Size. Heart-rate monitor. Ultra-low power consumption. Non-chest based heart-rate/SpO2 detection.