Beats by Dr. Dre Studio High-Definition, Noise-Isolating Over-Ear Headphones (Purple) Powered by a pair of AAA batteries, the noise cancellation feature in a pair of Beats Studio headphones amplifies the music as it blocks out noise. Today's artists take painstaking efforts when creating digital music. The extra-large speaker drivers, high-power digital amplifier, and advanced materials and construction are designed to accurately reproduce any type of music. The ear cups are covered with soft breathable materials, and are designed to stay comfortable during marathon listening sessions. The Beats by Dr. Dre logo on the side also acts as a mute button when you press it. No need to take them off to talk. The designers at Beats conducted a series of ergonomic studies to find the perfect lightweight, foldable headphone, and incorporated the results into the design of the Beats Studio. The built-in Mute button allows you to hear the outside world without having to remove the headphones.