... 6 TypesCommunication USB and key-button on the back PowerInternal Rechargeable BatteriesMaterial Acrylic front cover and ... via USB. Also use key-button on the back to change display entry, speed, mode and brightness.3 ... .7. Custom-made skin8. Message: Store up to 6 messages, each can store about 140 characters9. ... , such as from right to left, from up to down,from down to up,stop,flashing then scrolling ...