Sennheiser HD 660s Audiophile Headphones (Open box) - Discontinued true wireless up to 42H with BT)

up to 42H with BT) that charges as you play with the USB charging cable

without the unwanted side effect of causing the boom to dip

Single Crystal copper hook-up and signal wires are used throughout

The world’s shortest signal path

Sennheiser HD 660s Audiophile Headphones (Open box) - Discontinued true wireless up to 42H with BT)HD 660S The perfect blend of power and control. The powerhouse open back headphone Connects you to the deepest corners of your music collection. Hi fidelity sound Open back design 42mm transducers Luxurious comfort Detachable cable A Direct Connection To Your Music Known for their engaging signatures and liquid smooth response, HD 660S predecessors HD 650 and HD 600 shattered performance barriers in the audiophile headphone category. The HD 660S