VM-1504-HD Series is Mega Pixels HD Multi-Functional Mobile DVR .H.264 compression mode ,supports 4ch realtime 720P Mega Pixels AHD input and Analog satandard defition camera input; Exclusive pre-allocate DVR Special File system Technology,Solving repeatedly wipe cause file fragmentation, solving SD card file system collapse data loss and thus can not find SD card and file garbled,ensuring the integrity of the data 

Main Features:

1, H.264 Video Compression,Support 4CH 720P AHD Camera input;

2, Exclusive pre-allocated file system, solve the file fragmentation / SD lost / file garbled etc issue,protect data file;

3, 10-36V Wide Voltage, Lower power consumption;

4, SD Card Storage ( Dual SD Card, each max 128GB ),

5, Support GPS/3G/4G/WIFI /G-sensor module

6, High vibration Aviation plug

Q: GPS module is present but no coordinate information is available?

A: 1. Check if the GPS module is present; if not, please check if the HDD is installed or properly contacted.

2. Check if GPS antenna is properly contacted and if the antenna is broken. The antenna is recommended to be placed in an area having strong signal. Note that some car glass shielding film may form a GPS signal.

3. If the test is conducted indoors and the GPS antenna set indoors is shielded, it is recommended to place the GPS antenna outdoors.

Q: GPS geographic position is not accurately displayed on the map?

A: if the GPS module is positioned, it indicates that the signal is valid. Government limitation, error tolerance or GPS signal interrupt may cause deviation; The satellite map may have some deviation by for the sake of safety. In general, this problem can be solved by using GPS correction.

3G/4G wireless related problems

Q: What shall be noted if 3G wireless module is used for dial up?

A: If built-in wireless module WCDMA or EVDO is selected, the module settings are different and also depend on the model used; thus, please check the consistency between the module used and SIM card. Do not use Telecom Card in WCDMA-enabled devices.

2. Check if the server IP or port is correctly set, if 3G/4G signal is intense enough for dial up, and if dial up via 3G/4G is successful.

3. Please check if the 3G/4G antenna is properly contacted when dial up fails. Weak signal may result in failure to dial up; in addition, check if the SIM card has sufficient traffic; if not, dial up will also fail.