Brand: Sony. MPN: W-IC100. The WI-C100 redefine entry-level wireless in-ear headphones. With Sony’s exceptional sound quality, they offer a rich listening experience while a long 25hr battery life and splash-proof design give you peace of mind when you’re out and about. They’re also compatible with the Sony Headphones Connect app, so you can adjust sound to suit your tastes. Earbud Features.