The black Sennheiser CX 6.00BT are wireless in-ear headphones designed to provide wide-range frequency reproduction, lightweight comfort, and convenient integration with mobile devices for music enthusiasts, audiophiles, and the average listener at home or on the go. The dynamic drivers produce a frequency response of 17 Hz to 21 kHz and a maximum SPL of 112 dB.Bluetooth 4.2 and Qualcomm aptX deliver high-quality audio reproduction and multi-connection support allows you to pair up to eight devices, and switch between two simultaneously. The built-in battery grants up to six hours of playback and recharges via the supplied USB cable. Easily take calls with 3-way calling support and an in-line omnidirectional microphone. Control your music and media playback via the integrated 3-button remote. The CX 6.00BT ships with a carry case and an eartip set consisting of extra-small, small, medium, and large eartips.