These ControlTalk in-ear headphones provide many conveniences for the busy user. The ControlTalk feature on these Monster headphones enables the user to use an iPod without touching a button. One only has to say an instruction aloud (such as, “volume up,” “skip to next song,” etc.), and the iPod responds. The ControlTalk feature on these Monster headphones also allows the user to make handsfree calls using voice commands, a superb convenience, particularly for users on the go. With a 0.14-inch gold-plated connector, the Monster Heartbeats by Lady Gaga are compatible with a wide range of MP3 players, CD and tape players, computers, portable DVD players, and more. The cord on these Monster headphones measures at 4.27 feet in length and has a flat design that prevents kinking and tangling. These ControlTalk in-ear headphones have a sensitivity of 115 dB, with a range of frequencies it responds to, starting with 20 Hz, and ending with 20 kHz. The Monster Heartbeats by Lady Gaga, black chrome in color, boast deep bass without distortion, thanks to the high-performance drivers.