Audio Technica ATH-ANC9 Active Noise Canceling Headphones (Japan Import) QuietPoint active noise-cancelling technology reduces environmental noise by up to 95% Tri-Level CancellationTM - 3 noise-cancelling modes customize performance for airplane, office, & study 40 mm drivers for crystal-clear high-fidelity audio reproduction Luxurious memory foam padding on headband and earcups Audio functions (in passive mode) even without the battery