Huidu 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) |
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