UE’s new headphones use an app and LEDs to create a truly custom fit

Ultimate Ears recently announced the new $249 UE Fits, which promise to create a perfect mold of your ear during a fitting process that you execute using a phone app.

Once they’re nestled securely into the ear canal, users use an app to activate UE’s Lightform technology. The headphones themselves then emit a purple glow from integrated LED lights, which catalyze a reaction that causes the patented material to harden over the course of 60 seconds.