Sennheiser SET840 -TV RF Stereo TV Assistive Listening Headphones System Connectivity Technology: Wireless Wireless radio frequency system with transmitter and receiver (earphones) provide mobility within a range of up to 100 feet; even transmits even through walls Three selectable hearing settings on the transmitter to optimize speech. Ideal for plasma TVs TV connection cable with two 3.5 mm stereo jack plugs and one adapter to 1/4 inch (6.3 mm) jack socket NOTE: Refer the User Manual from the Technical Specification before use which is highly recommended.