Sennheiser's CX 400BT are its most affordable true wireless earbuds yet
Sennheiser CX 400BT True Wireless Earbuds - Bluetooth In-Ear Headphones for Music and Calls - with Noise Cancellation and Customizable Touch Controls, Black
Sennheiser CX 400BT vs Sennheiser MTW2 - Hear the Difference! - YouTube
Sennheiser CX 400BT Review: Simple Earbuds With Impressive Sound Quality
Sennheiser CX 400BT True Wireless Earbuds - Bluetooth In-Ear Headphones for Music and Calls - with Noise Cancellation and Customizable Touch Controls, White