""Say goodbye to knots and tangles, you get the freedom to move with Sony MDRRF855RKC wireless headphones. When the power is running low just place the headphones in the dock to recharge the battery. Give movies, TV dramas or big sports matches real atmosphere with deep, resonant bass from a powerful 40 mm neodymium driver unit. Get longer battery life by using the auto power on/off function when you are not listening. A soft head pad and ear cushions give you the comfort you need for long listening. No need to get up or move from the sofa, simply adjust audio levels using the volume control on the headphones. ""