Perhaps most critically, the HD 569 sealed earcup construction allows for listening privacy at the office cubicle or at the library without sound potentially escaping out from the headphones. The non-vented, sealed earcup also minimizes ambient environmental noises from creeping into your music, which can often result in having to turn up the volume to overcome outside sounds when using open-back headphones - perhaps not the best thing to do for your long-term hearing acumen.
The Sennheiser HD 569 earcup design has a cosmetic grill-like outer earcup that makes it almost look like the grill of an open-back headphone. But don't be fooled by appearances. It is indeed a closed-back headphone with a secure but loose-fitting, non-clamping headband frame. The fit ergonomics remain pretty comfortable for long listening sessions, like when you're finishing that crucial project at work or burning the midnight oil at school, but its still tight enough to maintain the all-important seal between earpad and earlobes for the best possible sound quality performance.
The Sennheiser HD 569 packaging includes two detachable cables, one 3m length with 1/4" stereo plug and a shorter 1.2m cable with a 1-button remote compatible with most newer smartphones.