Sennheiser Sound - high quality audio with engineered in-house transducer system. Enjoy exceptional battery life that lasts up to 50 hours on a single charge. ANC blocks out distractions so you can stay focused. Transparency mode lets you stay aware of your surroundings. Sound modes like Bass Boost and Podcast mode. Built-in 5 band equalizer lets you fine-tune every detail. Smart Control app - active modes control EQ and more. 37mm Dynamic driver size. Bluetooth 5.2 compliant. Rechargeable 800mAh Lithium-ion battery. Includes USB-C charging cable.