Dr. Dre member Ice Cube, Dr. Dre produced "Straight Outta Compton" (2015), a biographical film about N.W.A. In July 2008, Dr. Dre released his first brand of headphones, Beats by Dr. Dre. The line consisted of Beats Studio, a circumaural headphone; Beats Tour, an in-ear headphone; Beats Solo & Solo HD, a supra-aural headphone; Beats Spin; Heartbeats by Lady Gaga, also an in-ear headphone; and Diddy Beats. In autumn 2009, Hewlett-Packard participated in a deal to bundle Beats By Dr. Dre with some HP laptops and headsets. HP and Dr. Dre announced the deal on October 9, 2009, at a press event
Headphones used for early radio work. In early powered radios, the headphone was part of the vacuum tube's plate circuit and carried dangerous voltages. It was normally connected directly to the positive high voltage battery terminal, and the other battery terminal was securely grounded. The use of bare electrical connections meant that users could be shocked if they touched the bare headphone connections while adjusting an uncomfortable headset. In 1958, John C. Koss, an audiophile and jazz musician from Milwaukee, produced the first stereo headphones. Previously, headphones were used only by the US navy, telephone and radio operators, and individuals in