It has an audio jack outlet (also an optical audio out connection). You can use the on-screen menu to switch to 'external speakers'; then the headphones will work and the TV speakers cut off. This only takes a second, but is not automatic. Hope this helps.
I checked this out last night, and it does have an audio jack out. I didn't know this when I bought it. The speakers don't automatically cut out, but you can set the TV to "external speakers" in the menu to turn them off and the headphones will still work.