The SNAP Programmer communicates with your PC via the USB port ??? acting much like a jump drive or external USB storage device. A simple screen and keypad layout provides easy navigation. The built-in iButton reader allows for quick registration of iButton credentials, allowing you to move beyond simple numeric pin codes for building security and access control. USB plug and play connectivity 4 MB memory (can hold up to 100 door files at a time) iButton reader LCD backlit display Intuitive drag and drop functions Requires PC with USB port Manage an unlimited number of facilities or locations Set up to 1000 users per lock Maintains a history of 10,000 audits per lock (lock limit is 1000)