M5Stack Heart Rate HAT is a non-pluggable blood oxygen heart rate sensor with an integrated Maxim Integrated MAX30102 Pulse Oximeter and Heart-Rate Sensor. This sensor features an integrated protective glass for sturdy and durable performance, fast data output capability, high sampling rate, and high signal-to-noise ratio. The heart rate HAT uses I2C communication interface, internally integrates infrared light-emitting diodes, photodetectors, optical components, and low-noise electronic equipment. Typical applications include wearable devices, heart rate blood oxygen collectors, and smart medical.