SRH144 Portable Headphones Specifications SRH144 Portable Headphones provide extended range audio with dynamic Transducer Type high-end extension. The comfortable, lightweight, supra-aural design provides Dynamic, Neodymium magnet good external noise isolation, while the semi-open configuration delivers natural sound reproduction. Collapsible design and adjustable, padded ear Driver Size cups ensure long-lasting comfort and ergonomic fit for on-the-go use.