Advanced Bluetooth 4.1. CSR 8635 Chip with Bluetooth 4.1, powerful 40mm dynamic drivers to deliver rich sound, punchy, rhythmic response to the most demanding tracks for a high-quality audio experience Feel the true high definition clarity sound, while the powerful bass makes you feel the constant waves at wide frequency range of 20Hz - 20kHz Revolutionary ergonomic elements and perfect symmetrical interior part in the boAt Rockerz 430 makes it ultra-comfortable, lightweight, sturdy and a uber premium headphone Rather than focusing more on style and fashion, we aimed to construct premium headphones with superior ergonomics delivering utmost comfort and wear for a wholesome aural experience The headphones sport a fold-able and adjustable headband made from high quality PU material - from the well-constructed adjustable headband to your soft cushion ear cups, this is not just a regular headphone, it's a masterpiece Even the ear cups can move to easily fit your ear - so, kill the boredom and feel the real The fine materials make the boAt Rockerz 430 a cancel ambient noise product and with passive noise cancellation, it is constructed to strike the perfect blend between your music and the world outside