Sony Premium Lightweight Wireless Noise Reduction Hi-Fi Stereo Headphones For TV's Computer And Hi-Fi Audio Wireless Headphones - The Sony wireless headphone system transmits an uncompressed 900 MHz radio frequency signal to reduce unwanted interference while the real-time automatic channel tuning prevents signal degradation Lightweight And Comfortable - Adjustable soft padded headband and Over-Ear earpads designed to provide maximum comfort Long battery life - The headphones feature a built-in rechargeable battery that can provide playback for up to 25-hours per charge 40mm Drivers - The large 40mm driver units with neodymium magnets deliver broad, balanced, and accurate sound for an exceptional wireless listening experience Rechargeable Batteries - A 3.5 hour charge will produce a full charge of approximately 25 hours