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How to install the AP antenna?
Install the AP antenna a few meters higher than the vehicle WIFI antenna. Make sure it is within visible range together with the vehicle antenna.  
How to install the WIFI antenna?
The antenna must be installed on unobstructed place of the roof, and be fixed with glue. 
Why use the 5.8GHz external WIFI?
2.4GHz is with good penetration, but transfers short distance. 
5GHz transfers long but is with poor penetration. 
2.4GHz is with good anti-attenuation capability. But there are too many devices using 2.4GHz, which causes a lot of interference and can not ensure sufficient stability. 
802.11N uses 5.8GHz with three UNII bands from 5.1 ~ 5.8GHz. The best advantage is that so far few devices use this frequency band. Many countries require application for the permission to use this band, therefore the interference is very small and can ensure the quality of transmission. However there are also disadvantages: weak resistance to decay indoor, can stop working if with several wall insulation.  
Why it download so slowly through WIFI?
The actual speed is affected by various elements. 
1. 802.11 N standard is 300MB with the total bandwidth of bidirectional transceiver. One-way  bandwidth only needs 150 MB. 
2. Within short point-to-point distance it can reach 150Mbit. It becomes slower if transferring among multiple points at the same time, with the problem the wrong code and more connected devices. What’s more, the WIFI adaptive mechanism itself will adaptively reduce the bandwidth for the worst signal. 
What is the WIFI transferring speed?
Built-in WIFI: theoretically, 802.11N can reach up to 300Mb. During video downloading, the built-in point-to-point download speed is only 2.5 MB/S. Actually it transfers at 1 MB/S if there are three or more built-in WIFI device transferring at the same time. The more devices, the more slowly. It is recommended to download data within two devices at the same time; 
External WIFI: the point-to-point video downloading speed can reach up to 4 MB/S. If there are less than three device, it transfers at 10 MB/S at the same time. The more devices, the more slowly. It is recommended to download data control within five devices at the same time.  
What is the WIFI transferring distance?
2.4GHZ can be transferred about 100m outside. To achieve better effect we need to transfer within 50m. 
5GHZ can be transferred about 300m outside. To achieve better effect we need to transfer within 100m. 
What is the difference between built-in WIFI and external WIFI?
Built-in WIFI wireless transfer data via USB WIFI signal chip, with the processing capability based on MDVR main device, which is weaker transmission ability; while the external WIFI is with independent operating system and with more powerful processing capability. 
How to switch Easy Check between Chinese and English?

There is no languages switch in Android Easy Check .apk. Language switch means switching on mobile phone or Android pad. In addition, if the language is set to Traditional Chinese, the Easy Check software will automatically set as English status. 

Does the Card Reader support hot swapping when connecting to hard disk?

No, it doesn’t. Hot-swapping will damage the hard disk. It is recommended to disconnect the USB or power before swapping the hard disk. 

How much baud rate should I select for RS485 when the easy LED panel is connected to N9M product?
Select baud rate 9600. 
What the Max. capacity can the SD card of Easy Check support?
128G. So far we test with 32G and 64G SD card. The 256G and 512G on market use new standards. However, the Easy Check uses the old standard chip. Although it supports larger SD card theoretically, there will be compatibility issues. 
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