The Logickeyboard ASTRA 2 Backlit Keyboard for Avid Sibelius for Mac eatures an elegant, black keyboard with low-profile scissor-switch keys for a light, responsive feel. With five selectable light levels, the ASTRA 2 is the ideal choice for any lighting conditions. The keyboard features a USB 3.0 hub to enable you to connect a mouse, phone, contour shuttle or a USB dongle. The ASTRA 2 keyboard is developed with two USB cables: a gray one for the keyboard itself, and a black one for the USB hub to avoid problems with installations that require a KVM extender. In addition, the ASTRA 2 has a full-sized F-row and multimedia keys to provide full control and effectiveness. To power the keyboard, you need to plug in the gray USB connector. If you need to activate the USB hub on the back of the keyboard, plug in the black USB connector. This keyboard also features all the regular letter, number, and symbol labeling that you will find on a conventional keyboard, it can simply be used as a substitute for it. The keyboard is easy to plug in and requires no software installation.