-Single-Ear Wearing StyleBest for call center, business, video conference, conference calls, online class, etc.-40 mm Speaker UnitThe high-precision 40 mm unit deliver the accurate sound reproduction and hours of comfort listening.-Noise Cancelling Unidirectional Mic.Reduces unwanted background noise for clear conversation.-Tangle-free CableSensitive and tangle-free cable provides durability.-Soft Ear CushionsSoft on-ear cushions ensure comfortable wearing for hours use.