Product information "Sony MDR-RF855RK RF Wireless Rechargeable Headphones with Charging Dock"
Say goodbye to knots and tangles, you get the freedom to move with wireless headphones and a transmission range of up to 100m. 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 40mm neodymium driver unit. Get longer battery life by using the auto power on/off function when you're not listening. Enjoy 18 hours of listening with the included rechargeable battery or 28 hours using alkaline batteries from Sony (not supplied). 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.
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