nook competes with the Amazon Kindle , Sony Reader , and other readers , and includes Wi-Fi and AT&T 3G wireless connectivity , a six inch E Ink display , and a separate , smaller color touchscreen that serves as the primary input device . The Nook competes with the Amazon Kindle , Sony Reader , Apple 's iBooks for the iPhone and iPad and other readers , and currently includes Wi-Fi and AT&T 3G wireless connectivity , a six inch E Ink display , a web browser , a dictionary , Chess and Sudoku , and a separate , smaller color touchscreen that serves as the primary input device .