Wishlist Quick view US ROBOTICS US ROBOTICS USR3453C 56k Modem Networking $656.56 $452.80 U.S. ROBOTICS - COURIER USR3453C ANALOG MODEM,SERIAL - 1 X RJ-11 MODEM,56 KBPS (USR3453C). NEW FACTORY SEALED. IN STOCK. Compare Add to Cart Add to Wishlist