Lightweight and compact wireless earbuds with noise-canceling function. - Brand: Sony - Model Name: LinkBuds S WF-LS900N - Color: Black - Features: Noise canceling, lightweight, compact Thank you for viewing. Purchased on Amazon: Sony Wireless Noise Canceling Stereo Earphones LinkBuds S WF-LS900N: Lightweight/Small/Noise Canceling/Ambient Sound Mode/Various Usability/Black WF-LS900N BC Please refer to the images for the purchase date. I am selling these because I purchased a new pair. I have wiped them with an alcohol wipe and cleaned them with a cotton swab. There are no issues with their use. Ultra-small and lightweight body design: Achieved a 40% reduction in size compared to WFM4, realizing a comfortable fit that is easy to wear constantly and improved wearing stability. - High noise-canceling performance: Equipped with the same integrated processor V1 as WF-1000M4, achieving high noise-canceling performance despite its small and lightweight design. - High ambient sound performance: Significantly increased the amount of ambient sound intake compared to previous models, allowing you to listen while wearing the earphones without removing them. - High-quality call performance: Achieves high call quality with high-precision voice pickup technology, surpassing the call quality of previous models. - Ease of use and personalization: Equipped with various usability features such as automatic control functions, high battery performance, IPX4 water resistance, and spatial audio support. In addition to being the world's smallest and lightest (*) design with noise canceling and Hi-Res support, the design reduces the amount the earbuds protrude from the ear, bringing the center of gravity of the earphones closer to the head and achieving a stable fit. Furthermore, the "ergonomic surface design" increases the contact surface between the earphone body and the ear. The shape is designed to be less likely to interfere with the complex irregularities of the ear, allowing for comfortable use even for long periods.