DescriptionHuidu A3L Name Description Power supply 5V 3A ,12V 1.5A Reset Reset pinhole USB 2.0 Used for updating programs, inserting programs or expanding capacity(support change to OTG function) Output network port Gigabit output network port, cascaded with HD-R series receiving card Audio output TRS 3.5mm standard two-channel audio output port Wi-Fi antenna Connect Wi-Fi antenna to enhance wireless signal Sensor External temperature, humidity, brightness, wind speed, wind direction, noise, PM2.5, PM10, CO₂ and other sensors 4G antenna Connect 4G antenna (Only 4G version has)