Panasonic's ToughFeed paper feed mechanism makes the Panasonic KV-S4065CW the solution to your document scanning needs. The Stapled Document Detection virtually eliminates stapled documents from being fed, the double-feed prevention system employs an ultrasonic sensor that detects the double feeding or originals during scanning and the Load Detection circuit allows the document hopper to automatically adjust its position to ensure reliable paper feeding. This innovative design has been proven effective even when the documents being scanned contain a mix of paper of different weights or thickness. Thanks to ToughFeed, optimum reliability is assured even when scanning high-volume documents.