Sennheiser HD700 These are Sennheiser wired over-ear headphones with an open-back design. They feature soft, cushioned ear pads for a comfortable fit. [Specifications] * Headphone Type: Open-back * Connection: Wired (No noise cancellation) * Headphone Jack: Standard plug * Surround Sound: Not supported Used only 2-3 times and then stored for several years. Sound check has been performed, and they are in perfect working order.