Sony 900MHz Wireless Stereo Noise Reduction Headphones With 40 mm Driver Units, Automatic Tuning, Up To 45 Meter (150 Ft.) Reception Range, 25 Hour Battery Life, Volume Control On Headphones, Easy Connection Of TV, Hi-Fi, And Other Components, Model MDR-RF985RK These wireless headphones from Sony provide you the freedom to roam freely through your house while listening to your favorite tunes. Simply connect the RF transmitter to an audio source such as a television or home sound system and you're free to walk up to 150' away. Noise reduction technology reduces interference so you get the cleanest signal possible. The transmitter also acts as an induction charger for the headphones, so you can cradle them quickly without worrying about pin contacts. The headphones are designed to keep you comfortable for hours, thanks to the adjustable, padded headband and thickly-cushioned earcups. The 40mm neodymium drivers provide great sound with a full frequency range so you hear every detail. The headphones feature automatic on/off and have a built-in volume control so you can make adjustments without returning to the audio source.