Provides reliable, high-level assistance for demanding engineering and surveying applications. Library of 180+ scientific and engineering constants and units. More than 2,300 built-in functions. Structured programming for creating applications. Serial port for transferring files between calculator and PC. IrDA port for sharing data with another HP 48g11 calculator at high speed. Power Source(s): Battery; Display Notation: Engineering; Graphic; Number of Display Digits: N/A; Display Characters x Display Lines: N/A.