Hidden cameras may bring to mind Cold War–era spy dramas or suspicious-looking teddy bears hiding nanny cams, ... and the camera records on a micro SD card. $33 at Amazon Buy.

Mosquito-sized drone unveiled by China for covert missions; nearly invisible, radar-evading, and capable of spying indoors, ...

China just unveiled a tiny spy drone that looks exactly like a mosquito. Yup, the future is here, and it’s buzzing right past ...

1. Check out the local Wi-Fi network. Most Airbnbs offer some kind of guest Wi-Fi. Log into it and hop into your settings to view the Wi-Fi network and see if you can find all the connected devices.

Estimates for the miniature and spy cameras vary from €500 (£420) to €10,000 (£8,400). The cameras will go under the hammer in Wetzlar, Germany, on June 27. History.