The CX Plus has a similar design to the CX and CX 400BT true wireless earbuds Sennheiser currently sells. The outer touch panel is a rounded rectangle compared to the circular exterior of the Momentum buds. On-board touch controls give you everything you need to play music, take calls and use a voice assistant without reaching for your phone. As the name implies, the CX Plus has features that aren't on the CX True Wireless. That includes a Smart Pause feature, which is basically just automatic pausing when you remove an earbud from your ear, but Sennheiser has given it a fancy name. Smart Pause was previously reserved for the pricier Momentum True Wireless 2.