The Knox Gear Earphone Case provides portable protection for the Sony Wf-1000XM4 Noise-Canceling Truly Wireless Earbuds. This set contains Sony Wf-C510 Lightweight Truly Wireless Earbuds with up to 11 Hours of Battery Life (Yellow), Hybrid Silicone Earbud Tips, a Charging Case, a Limited 1-year Warranty, and a Knox Gear Earphone Case Compatible with Sony Wf-1000XM4 Noise-Canceling Truly Wireless Earbuds.