Able to drive multiple LED panels onboard vehicle,and to control 4 grade luminosity of display panels both inboard & outboard vehicle. * Utilizing for the first time in stop annunciator of DSP chip with audio compression function to enable voice quality with higher fidelity, and flawless sound *Able to automatically control voice volume of announcement * To perform synchronized revision of annunciator and display panel both onboard vehicle, by utilizing CF memory card ( of 8M bit--32Mbit). Upon revision by computer of memory card, the stop name and ads service data can be transferred to memory of onboard vehicle digital annunciator, at the same time, the text to be displayed is transferred automatically to LED panels both inboard and outboard vehicle to implement a synchronized revision by computer of annunciator announcement and displayed text. * Able to store a volume of 4 bus routes and to revise one of them at choice by way of CF card. * To perform basic operation of the annu