THE CLOSEST YOU WILL GET TO BUYING A PAIR NEW IN THE 70's AND PUTTING THEM IN A TIME-CAPSULE except for the box on this pair. That has suffered the rigours of time.Orthodynamic - using a single point to drive a coil speaker membrane gives loudspeaker level performancewithout the colouration of a roomLightweight for comfort during extended wear periodsRetain a slim profile so that you don't look like you're wearing "ear 'tectors"Fully bespoke fit with in-out, up-down and side-to-side adjustments for each ear ensuring that you get the maximum sound sent into your ear canal for a top quality listening experienceEnshrined as a design classic in MoMA (Museum of Modern Art) New York (I think that they want to buy this pair!). Own a design classic / piece of art2 Watts RMS provides real volume when in noisy environmentsSome background noise let in so that you don't suffer 'podblivion' and get run over, trip up or muggedPresented in the Da Vinci inspired box to keep them pristine. Tarnished condition but expected for its 35+ years plus age3 Metres (10 feet) of cord really lets you move around or sit on the sofa away from your Beocenter
Forget Beats by Dr. Dre (now Apple) he ain't even a real Doctor and the sound reproduction is a joke. I'm a time-served Sound Engineer, I KNOW. These were made to sound like speakers (140 Ohms sensitivity) and they dobecause the operate like speakers! These were Bang & Olufsen’s first headphones and were of the semi-open type which allowed some intrusion of background noise so one was not completely oblivious to the outside world. They were described as being orthodynamic in principle which essentially meant they used a single point to drive a membrane. In other words they had a standard coil driven speaker as opposed to an electrostatic plate. Nonetheless, the headphones looked sleek and were comfortable to wear. The pads were covered with a type of leatherette which disintegrated with age, BUT NOT ON THIS PAIR! though this had no effect on sound quality. They were presented in later years in a rather splendid box with a drawing clearly inspired by Leonardo da Vinci but featuring the U70!These were a popular addition to the range and were the most substantial of all B&O headphones.

Testimonials :
"Conforme à la description, satisfait de mon achat. Vendeur à recommander !""A great pair of headphones. Both beautiful and functional. I couldn’t be happier. Thankyou"
Manufactured: 1978 - 1984Designer: Jacob JensenBang & Olufsen U70 stereo headphones offered quality, convenience and comfort. Whether you were seeking perfection - music straight from the system withoutcolouration from room acoustics - or privacy, you needed accurate contact between your ears and the ear cups.Bang & Olufsen's U70 headphones were probably the most useful accessory you could buy at the time of theirintroduction, for your hi-fi system. Unless you lived alone and had only yourself to consider, or were lucky enough to have a separate room devoted exclusively to music, headphones were, and still are, virtually a must. They not only provide a private world for the person who wants to listen without distraction, they also allow others in the household the freedom to talk - or watch TV - uninhibited by the music.
U70 headphones were lightweight (only 300 grams) and were very comfortable to wear, even for long periods.The ear cups could be individually adjusted both vertically and laterally and locked into position. You couldalso adjust their height using the inner headband. The softly-padded ear cups were of the semi-open type:they excluded most extraneous noise but were not so completely sealed that you could not hear the phone ring.
Technically the U70s had a power handling capacity of 2 watts RMS and used the ortho-dynamic principle toreproduce sound with all the accuracy and fidelity of a good loudspeaker. They were supplied with 3 metres ofcable fitted to a jack plug. 
Connecting the plug to the headphone socket of your Bang & Olufsen receiver automatically switched off the mainspeakers.
Connection: 3-metre cable with 6,5mm jackplugFinish: black and natural aluminium
In 1979 three more of Jacob Jensen's designs for B&O were included in the Design Collection of the Museum ofModern Art in New York including the U70 Headphones.