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The STU-430 is a full-featured, monochrome signature pad with a thin design and a low-profile, flat surface. The 4.3 inch screen is large enough to capture longer signatures as well as to accommodate soft buttons in addition to the signature area. The transflective LCD is easily readable in varying light conditions. The STU-430 is extremely durable, featuring Wacom's patented maintenance-free EMR technology with no less than 1024 pressure levels and a hardened glass surface that protects the LCD screen and is highly resistant to scratches. For security an AES-256/RSA-2048 encryption comes along with the STU-430. The integrated pen holder doubles as a USB cable lock to prevent accidental disconnection of the USB cable.