（1）Taxi/car top LED display screen function features:
1. Taxi roof LED display, GPS/GPRS wireless advertisement distribution system
2. Advertisement information can be broadcasted synchronously in the whole city, millisecond by millisecond, more than 15000 vehicles can be sent synchronously
3.Integrated GPS positioning satellite map, electronic fence, emergency alarm, historical track playback, checking vehicles by road section and area.
4. Can be released through the web page and client, advertising information (can display part of the simple graphics and logos), dwell time, play mode, and brightness adjustment.
5. High brightness, high contrast, can be clearly displayed in direct sunlight, adapted to outdoor advertising information release.
6.Support remote fuel and power cutoff, empty and heavy vehicle display (empty vehicle/passenger), and remote open door service.
7.Wide voltage input: DC9V-36V, waterproof, shockproof, high temperature resistant design.
8. Highly integrated motherboard, produced by listed companies, using imported materials and components, stable and reliable performance, strong signal, no dropouts, fast positioning, high temperature, waterproof, anti-corrosion, light box using imported high-brightness waterproof light bar, and fire-resistant and heat-resistant wire design
9. Factory direct sales, high quality assurance, free technical guidance, including cab roof light advertising, cab GPS, cab LED dynamic advertising screen + wireless advertising distribution system integrated solutions for user operations to provide one-stop all-round training services
10. Diversification of carrier information, memory 256 advertising address units, each unit can store and display 128 Chinese characters information. Support for Chinese, English, Russian, Viennese and other multi-language display.
（2）The cab roof advertising screen product parameters
Model： LBT P2.5
Pixel pitch： P2.5
Resolution： 128*128dots
Display size ：960x320mm
Cabinet size ：1040x440x100mm
Brightness ：≥4500cd/m²
Average power： 140w/m²
Refresh ：≥3840Hz
Weight： 20KG/set
Working voltage： DC12-36V
IP Rating： IP65
Control Mode： USB/Network/WIFI 4G/5G optional
Scanning Mode： 1/16 Scan
Applicable Standards： CCC/CE/RoHS/FCC/CB/TUV/IEC
（3）The advantages of cab roof top LED display
1. Advertising advantage: advertising is a form of information service. The emergence of wireless advertising system of cab roof LED screen provides the possibility to expand the advertising market in depth and fully display the elements of the enterprise. It has the advantages of convenient placement, high return on one-time investment, large information capacity (the same carrier to do more than one advertisement), efficient and quick (no matter where the vehicle media, no matter how many, a number of seconds of time information can be sent out), high utilization of the carrier (advertisement change manpower, material costs nearly zero), good night vision, is the traditional common screen can not be compared.
2. Advantage of early warning and alarm: cab advertising screen added early warning and distress function, when encountering an accidental robbery, the driver starts the alarm switch, the screen immediately interrupt the advertisement.