The case of Edimax Airbox is easy to open. This is one clear benefit when the device needed to be service

the PM2.5 sensor can be pulled out by removing two small screws

PMS5003, a older sister of PMS7003, is PM2.5 sensor. PMS5003 is thicker.

Airbox is a completed PM2.5 device. Its main chip is ESP32 Dev Board from Espressif

Two micro USB onboad, one used for supplying power. Another is for debugging (can only accessed after moving out of the case)

temperature and humidity sensor showing on the small blue breakout board (far left)