Review on Enhance In-Car Entertainment: 4-Pack of Folding Universal Rear Entertainment System Infrared Headphones - Wireless IR DVD Player Headphones for TV, Video, and Audio Listening by James Hardin

The battery life of these headphones is amazing - a set of AA batteries lasts several days of driving. They turn off automatically if the rear entertainment sound is off for more than a few minutes and have very good sound quality. They also appear to have an AUX-in jack, but I haven't tried it out of the car yet. No settings, no pairings - just plug into channel "A" and forget.