Hi-Res Audio compatible true wireless earbuds, with 28-hour battery life and IPX4 water resistance. - Brand: soundcore by Anker - Model Name: Liberty 4 - Features: True wireless earbuds - Water resistance: IPX4 - Battery life: 28 hours - Included items: Ear tips (S, M, L) Purchased a year and a half ago, and used for about a year. Please understand that these are used. They are working without any particular problems. Thank you for looking.