The Magic Jack PLUS is a black unit that provides free local and long distance calling using VoIP technology. It has one phone line and can be connected using Ethernet (RJ-45) interface. The unit also features Power Over Ethernet (PoE) for convenient power supply. It comes with the Gigaset C430 model and is easy to set up for home or office use. With no hidden fees or contracts, the Magic Jack PLUS offers a reliable and cost-effective communication solution.