Product 1: Superior sound powered by the TrueResponse transducer and aptX Adaptive for the highest resolution audio Product 1: Customized audio experience via built-in equalizer and pre-sets, including Bass Boost, and Sound Personalization for bespoke audio Product 1: Control the environment with Adaptive Noise Cancellation for immersive music without distractions and Transparency Mode stay in touch with the world around Product 1: High quality voice pick-up from the three advanced noise-cancelling microphones on each earbud ensure clear speech, not surrounding noise Product 2: THE ULTIMATE EARPHONE UPGRADE - True Grip Pro tips for the Sennheiser Momentum True Wireless let you experience a dependable, stay-in-ear grip designed to hold on and not let go until you're done listening. The integrated TechDefender ensures your earbuds are safe from moisture, no matter the sweat you work up, without sacrificing sound quality. Product 2: Compatibility - designed exclusively for the Sennheiser Momentum True wireless earbuds Product 2: Enhanced sound & fit - body-heat activated memory foam adapts to your own dynamic ear canal and provides a perfect seal–every time. The superior seal isolates you from outside noise and enhances bass for an unparalleled earphone Audio experience so you can stay in the zone. Product 2: Superior comfort - Super-soft Comply memory foam dramatically reduces earphone irritation and fatigue. Comply foam is 30x softer than silicone, so you have the most comfortable listening experience while you're working out, commuting or just hanging out.