bus auto stop announcer

1.Use GPS technology, without manual operation, sharing the driver labor intensity, safe operation
2.5HZ GPS technology and external antenna GMOUSE, signal stronger, more accurate positioning
3.Support u disk upload/download data and automatically detects and update the U disk data
4.Support set station coordinates, trigger distance and drive direction on Google Earth, do not need Collect points
5.Electromagnetic interference (EMI) multi-barrier treatment, especially adapted buses loaded gasoline
6.Each speaker inside and outside the vehicle to support 15W digital amplifier, reducing audio effects, playing without distortion 
7.Support wide range work voltage 10-30V DC