JVC&0s HA-NC250 noise-cancelling headphones isolate outside noise to provide you with a superior listening experience. With these HA-NC250 headphones, you&0ll be able to listen to your favourite music clearly without cranking up the volume. Each earpiece boasts a double-housing structure for an extra sound-insulation layer, which eliminates up to 85% of background noise. Plus, audio quality isn&0t altered thanks to the 40mm driver & gold-plated contact. The JVC HA-NC250 headphones work on a single AAA-type battery (supplied). Included accessories: carry case, AAA-type battery & 6.3mm dual-plug flight adapter. Headphones HA-NC250 Noise Reduction 18d B at 150 Hz (85%) Driver Unit 40.0mm Magnet type Neodymium Frequency Response 8-24, 000 Hz Input Impedance 40ohms (when ON), 96ohms (when OFF) Sensitivity 102d B/1m W (when ON), 100d B/1m W (when OFF) Power Supply AAA battery (DC 1.5V) x 1 Battery Life (approx.) 50hours (using Alkaline battery) Cord Length 3.94ft (1.2m, detachable) Weight (without cord) 150g (with AAA battery) Plug iPhone compatible, Gold Plated Accessory Carrying case, AAA battery x 1, Dual plug adapter (for in-flight use), 6.3mm plug adapter