Novation also released a full-duplex Bell 212-compatible expansion board known as the Novation 212 Expansion Card, which plugged into the Apple II motherboard as well as an existing Apple-CAT II via a ribbon cable. The card was very expensive and rarely seen. Novation also created an 'Expansion Pack' or external breakout box that would connect to the large pin header on the top middle of the card. This item allowed easy external access to the built-in serial port, phone line and handset connections. Due to its cost at the time, the item is very rare.