Audiophile tuning:Sennheiser's in-house 42 mm transducer and refined acoustic design deliver a neutral audiophile sound with lifelike mids stunning detail and a wide natural soundstage. With minimal digital processing ensuring pure fidelity true to the original recording. Wireless or wired: Enjoy high-resolution wireless sound with support for aptX HD and aptX Adaptive especially when paired with the included BTD 700 Bluetooth adapter. For maximum purity connect via USB-C for lossless listening up to 24-bit/96 kHz. Parametric EQ: Expert-level equalization lets you define frequency bands widths and filters to precisely shape your sound. Tailor bass enhance vocals or fine-tune for any genre just like a mastering engineer. Adaptive ANC & Transparency Mode: Powerful noise cancellation blocks distractions without degrading clarity dynamics or balance. Transparency Mode instantly lets in surrounding sounds when you need to stay aware. Listen for days not hours: A class-leading 60-hour battery keeps you going through long trips or work weeks. Just 10 minutes of fast charging adds up to 7 hours of playtime ideal for when you're on the move. -