An electronic writing instrument introduced in 2010 by the Improv Electronics division of Kent Displays. Using the accompanying stylus and resembling a handheld memo pad, the battery-operated devices use a type of LCD writing surface that retains its image without power. Boogie Boards are erased by pressing a button. In 2011, the Boogie Board Rip added internal storage for saving approximately 200 images as PDF files, which were transferred to a computer via a USB cable. Two years later, the Sync model added more storage along with transmission via Bluetooth to Evernote, e-mail and social media. See cholesteric LCD.