Powerful 11 mm Driver: We've made our driver even more compact. With double the power than Ear (2), Ear (a) delivers an even deeper bass performance. The extra space gives sound waves more room to vibrate. With two new vents, airflow is improved inside the bud. For less distortion and richer overall clarity
Smart Active Noise Cancellation: Up to 45 dB,Nothing Ear (a) automatically checks for noise leakage between the earbud and your ear canal, then applies more noise cancellation to make up for it. So you receive the best possible noise cancellation. Happens every time you put them in. So you can go from quiet rooms to busy streets without hearing a thing (other than what's playing)