| 摘要 |
The purpose and uniqueness of this device is best described by current devices such as 3M's device using infrared and devices using radar which is effective in direct line of sight and at short distances unlike EWD device utilizing transponders which doesn't require direct line of site and utilizing car stereo's to facilitate the activation of signal response in that the emergency vehicle transponder would activate receiver device signal received by other vehicle antenna's relaying the signal to the vehicle stereo in turn activating internal switch's and voice recorder/playback module which over rides internal stereo and bypasses it's normal relay of radio stations broadcast and announces twice to the driver that a emergency vehicle is approaching his location and then returns the device to normal mode weather the device is currently turned on or off.
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