SIMOLIO Wireless Headphones for TV, No Audio Delay, Cordless Headphones, 2.4GHz Digital Over-Ear Headphones with Transmitter/Microphone, Closed-Back These are wireless headphones for TV with no audio delay. Purchased for 8,999 yen. Stored indoors after several months of use. I used them when playing FPS games on TV, and I didn't feel any delay despite them being wireless (this is just my personal opinion). *Audio output is connected to the optical digital cable port on the TV side. There is no instruction manual, but you can check the manual on the following site: https://manuals.plus/ja/simolio/sm-825d-pro-2-4ghz-wireless-tv-headphones-manual-pdf