Casio Fx-730p Pocket Computer Tech features: Working with two AA 1.5V battery. The netto weight: 315g (massive) 8kB RAM capacity (expandable) 24 digit dot-matrix LC display Built in piezo speaker Backup battery Serial por Features: 100% BASIC compatible, with CASIO-BASIC operation system Preinstalled applications and functions: Advanced BASIC interpreter for BASIC programs Data-Bank functions (phones, names, etc... ) Calculator with 61 scientific functions