Keen ey to spot the logo on the device at the top of the vehicle window. The logo may be a sticker or it may be a more permanent fixture on the product.
Not sure the label would signify a tool used by the authorities. Seems everything goes through this b'cracy when entering or exiting China.
The "I see Q" double meaning? Heh.
CIQ – China Inspection and Quarantine: The Definitive Guide
https://www.export2asia.com/blog/ciq/