SONY MDR-NC17 headphones with noise-canceling function, a battery-powered wired model. Purchased over 10 years ago and kept unused, it functions without problems for general use, but the noise-canceling performance is lower compared to current products. Please consider this more of a collector's item. Power and audio playback have been confirmed. No box or instruction manual, only the item itself is included. - Brand: SONY - Model Name: MDR-NC17 - Features: Noise Canceling - Power Source: AAA batteries - Connection Type: Wired Thank you for viewing.