Sony Wireless Stereo Headphones System, 40 mm Driver Units, Self-Adjusting Headband, Up To 10 Meter (33 Ft.) Reception Range, Up To 28 Hours Battery Life, Volume Control On Headphones, Easy Connection To TV, Hi-Fi, And Other Components Infrared Transmission Up to 26' (8m) from Line of Sight Frequency Range 10Hz- 24kHz Foam Ear-Pads Rechargeable Battery Included