The STU-430 is a small and robust. extremely durable signature pad. Its 4.5monochrome screen is large enough to capture longer signatures as well as to accommodate soft buttons in addition to thesignature area. The transflective LCD can easily be read in varying light conditions. A hardened glass surface protects the LCD screen and is highly resistant to scratches. The integrated pen compartment doubles as a USB cable lock to prevent accidental disconnection of the cable.Both signature pads feature a new thin design and a low profile. flat surface. The new design reflects the market requirements for modern. robust. ergonomic and reliable signature pads. They are equipped with Wacoms patented maintenance-free EMR technology. delivering 1024 pressure levels. For security. an AES 256 bit / RSA 2048 bit data encryption is embedded in the signature pads. Each unit is assigned a unique hardware ID in order to determine the exact unit that was used to capture a particular signature.