The MM5D91-0B is the Smart Entrance Counter sensor solution which integrates 60GHzmmWave technology counts number of people entering and/or exiting an entrance. The module simplifies the implementation of mmWave sensors in the band of 61.0 to 61.5GHz, and it includes the ARM Cortex-M4F based processor system, 1Tx 3Rx antenna and onboard regulator.