Philips released new headphones Philips Fidelio NC1 with drivers based on neodymium magnets, with 7 – 40000 Hz output sounds frequencies. Drivers diameter is 40 mm, their sensitivity is equal to 107 dB and they have 16 Ohms impedance. Headphones are designed in closed acoustic system with noise cancellation functions. They have 2 microphones inside and outside of each ear can, which analyze sounds outside and inside of cans and allow headphones to alter sound signal, so that it cancels outer noise, while preserving original signal, when it mixes with outer sounds. Acoustic chambers are designed so that they are comfortable and do not alter sounds, all frequencies : low, middle and high pass through them non altered and non attenuated. Philips Fidelio NC1 are connected to sound source with 1.2 m copper cable with 3,5 mm mini-jack gold plated connector. They weight 191 g and has following sizes : 16.4 x 14 x 7 cm ( height x width x depth ) and consist of aluminum and rubber parts. Package contains : Philips Fidelio NC1 headphones themselves, 3,5 mm mini-jack cable, and USB cable for recharging of internal battery.