Warning: This story contains some offensive language
So-called spy-cam porn has existed in China for at least a decade, despite the fact that producing and distributing porn is illegal in the country.
But in the past couple of years the issue has become a regular talking point on social media, with people - particularly women - swapping tips on how to spot cameras as small as a pencil eraser. Some have even resorted to pitching tents inside hotel rooms to avoid being filmed.
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Don’t forget Bluetooth. I have a handy app called “Bluetooth scanner” which scans for Bluetooth signals.
It creates a list with the names of the devices it finds, plus other info like the device’s internal name, vendor name, BT address, signal strength, protocol and so on.
It even has a feature which helps you find the device based on changes in signal strength as you walk around.