The Compact/C TTY is excellent for travel. It actually folds in half and snaps shut in its own self-contained, hard plastic case! Now the Compact/C is even more convenient because it is compatible with select digital cellular phones (phone not included). (The availability of TTY-compatible digital cell phones and TTY-compatible digital wireless networks are still limited but are expected to increase throughout the year. Please check your wireless network provider or cell phone manufacturer before buying.) The Compact/C has a different TTY-to-cell phone cable that connects to the "hands-free" jack in compatible digital cellular phones. There is also additional memory (32K vs. 8K in the old Compact/C) to store phone numbers, memos and conversations. One year warranty. Please Note: If you own an earlier model of the Compact/C that has a built-in 3.5 mm jack and was manufactured after March 1999, you may upgrade it for a cost of $49.00. Call 1-800-482-2424 for more information.