Noise-cancelling headphones for use at home or on the go that are equipped with an active noise reduction system and filter away up to 85 percent of all annoying ambient noise. They also provide a great comfort so they can be used even on long trips: their ear cushions are very soft and gently adapt themselves to the shape of the ear. They reduce noise via a two-way system: ambient noise from the outside is attenuated, while the sound of the 40mm Mylar speakers is prevented from permeating to the outside. This allows user to enjoy music, movies, podcasts and more without disturbing those around him. There is a volume control on the right ear, as well as an on/off switch for noise-cancelling filter. In addition, the extendable headband is pleasantly padded and can be adapted to almost any head size or shape. The headphones work with virtually any modern audio equipment, including iPhones, iPads, smartphones, tablets, computers, DVD players, stereos or TVs. Since not every device has a 3.5mm stereo jack, they come with a 6.3mm jack adapter and a dual plug adapter for airplanes. For safe and easy transport, the headphones can be folded flat and also come with a hard case that features a small pocket inside for the detachable audio cable and the adapter plug. Frequency range: 30 Hz-20 kHz. Impedance: 32 Ohm. Power: 100 mW. Distortion: <1%. Frequency range noise filter: 70-1200 Hz: Dimensions: 215 x 180 mm. Weight: 175 g. Power supply : 2 x AAA batteries (included). Black colour design.