If Person of Interest or all this news about the NSA has you worried that you’re being watched everywhere you go, no worries, you probably are. Their are surveillance cameras everywhere, and while most of them aren’t there to track you, they can be used to see where you went and what you did.

A convenience store owner keeps an eye on his parking lot, and you pass by, you’re caught on his tape. A florist is watching the flowers in the front of their store, you’re on their tape too. There are traffic cams, stop light cams, and street corner cams everywhere.  It’s probably safest to just assume that you’re being watched by a surveillance camera everywhere you go.

If you rather not make that assumption, and you would rather let technology do it for you, then you’re in luck.

A British artist, James Birdle, has created a wearable device that he calls the “surveillance spaulder”. It takes it’s name from a piece of medieval armor that was worn on a persons shoulder to protect them from attacks from above. Like it’s original use, the “surveillance spaulder” protects the wearer from electronic attacks from above.

Now the “surveillance spaulder” doesn’t thwart surveillance systems it just lets the wearer know that they’ve fallen under a cameras gaze. It helps them consciously know when they are being watched.

The wearable technology works by responding to the infrared light signals that are commonly found on surveillance cameras. When the “surveillance spaulder” receives the infrared light signal it sends a signal to two “transcutaneous electrical nerve stimulation” which makes the wearer twitch a little in the shoulder according to the Atlantic.

This is pretty much a walking art project of sorts for Birdle and it’s not clear whether or not it will ever make it to market. It would be pretty easy to replicate the technology though. In fact the directions to create it yourself are in the video below. The Atlantic also makes mention of several other devices used to thwart surveillance cameras and facial recognition software like various t-shirts, make up and hairdos, here.