Amazon.com: Sennheiser CX True Wireless Earbuds - Bluetooth In-Ear Headphones for Music and Calls with Passive Noise Cancellation, Customizable Touch Controls, Bass Boost, IPX4 and 27-hour Battery Life, Black : Electronics
Amazon.com: 12pcs (TRS-B) Small (S) Replacement Ear Adapters Earbuds Ear Tips Compatible with Sennheiser IE Series, CX Series, CXC Series, CXL Series, OCX Series, and MM Series in Ear Earphones Headphones :