Magic Jack Original Model #A921 USB VoIP Phone Adapter With USB Adapter PreownedThe Magic Jack Original Model #A921 USB VoIP Phone Adapter with USB Adapter is a silver-colored device that allows users to make and receive phone calls through their computer's USB port. With one phone line and a USB interface, this unit is easy to set up and use, making it ideal for those looking to use VoIP technology for their home or office phone needs. The Magic Jack brand is known for its reliable and user-friendly products, making this a great choice for those looking for a simple and efficient solution for their communication needs.