The innovative technology used in the Nady QH-30NC RacketBlaster Noise-Canceling Headphones eliminates unwanted outside noise and enables your private listening pleasure even in noisy environments. The QH-30NC Headphones deliver a full, rich sound in a convenient compact folding design. Great for traveling in airplanes or any other noisy environment.State-of-the-art Noise-Canceling circuit design eliminates virtually all background ambient noise for completely quiet listening enjoyment Large 30mm drivers for unsurpassed audio rich and powerful with full frequency response and punchy bass Compact folding design and leatherette pouch for easy transport while traveling perfect for private listening without distracting ambient noise in airplanes and other noisy environments Full-size padded leatherette ear cups and adjustable headband for ultimate long-lasting wearing comfort and fit for all head sizes Uses single AAA battery (included) 3.5mm stereo mini-plug 2-prong airline jack adapter included Operates as standard passive headphones when noise-canceling circuitry is inactivated