... can be re-programmable( sounds can be changed by programmer)*Modules with 16pin(4 I/ O_,28pin(10 I/O) ,built ... have extra control mode (parallel interface ,Matrix 3X 8)*Modules can be controlled by Keys ,or MCU (like PIC , AVR ....)*Duration depends ... in museum/ pictures and so on.sound module , voice ic modules, voice module, recording module , recordable module , recordable sound module , voice ...