Cameras and other sensors. You do need to scan a QR code from the app before coming in. Some other comments mention having trouble with it, being billed for th

Cameras and other sensors. You do need to scan a QR code from the app before coming in. Some other comments mention having trouble with it, being billed for things they shouldn’t have. But I personally never did. Even though I enjoyed fooling around and trying to trick it by picking stuff up just to put it back. Or coming together with someone else, both using my QR code, and picking stuff up separately. Never any issue. Although, obviously, ymmv. It’s honestly among my most memorable experiences in the past two years.