Wacom offers additional products which it marketed in various parts of the world. The Graphire Wireless is a 6 in × 8 in (15 cm × 20 cm) version of Wacom's discontinued Graphire line (largely replaced by the Bamboo) which communicates with the computer via Bluetooth rather than a USB cable. The Graphire digital pen is interchangeable with the original Bamboo model's digital pen but not later Bamboos. In Europe, Wacom offered the Colorelli, a tablet and software package marketed as a creative outlet for children; "JustWrite Office" a basic tablet for capturing written input in office applications; the PL Series, similar in function to the Cintiq but with more modest specifications suited for office use; and the "Signature Tablet", a monochrome display/tablet for capturing signatures. At CES Asia 2018 Shanghai, Wacom unveiled its first retractable ballpoint pen for EMR technology; in this pen the coil surrounds the cartridge enabling refill manufacturers to provide Wacom compatible refills in the future.