How to choose a Car DVR for your car?

Any car owner is safe from accidents on the roads, which include not only a car accident, and a meeting with the disgruntled employees of traffic police.  And in the first and in the second case to prove his innocence is very difficult, especially in the absence of witnesses.  It is for this reason, have become increasingly popular Car DVR – compact devices that are installed inside the vehicle and on the video capture everything that is going on outside when driving or parking.
 The most popular by far DVRs are equipped with one or two cameras.  One camera, as a rule, is directed along the vehicle and “sees” everything that happens in front.  If the unit is equipped with a second camera, then it is directed into the passenger compartment.

 It should be noted that the current model does not DVR cameras.  These devices are in the form of small boxes and completed special alarm inputs that receive signals from external sensors that activate the account, as well as connectors for external cameras record.  All the content is stored on the hard disk,
which is attached to the instrument.

 Besides camera DVR can be equipped with a microphone that lets you record video with sound.  If necessary, the microphone is turned off.

 To allow video in low light or at night DVR features IR illumination.

For fixation of the device in the vehicle has a strong and reliable suction cup and bracket (usually included).  Light weight (several hundred grams) can attach the device on the windshield.  After fixation, the device can turn the recorder so as to provide the best angle to record video.
 The package usually includes one or more cameras.  Additional devices can be added, for example, in the back of the vehicle – it will provide video capture at other angles.  Keep in mind that additional cameras can only be connected to the DVR, which comprises more than one channel of video.

2.5" TFT LCD Vehicle Car Camera HD DVR Dashboard Recorder

The HD DVR can capture high definition pictures and display it on its 2.5 inch TFT LCD Screen
At the same time, this car camera will record and save the video files in the SD/MMC memory card
With the camera holder/mount, you can fix it on the car dashboard or car windshield very easily
The high quality video & audio can be timely and strong evidence to address accident and distinguish responsibility
It's also a functional assistant of your private security
The DVR can capture clear videos for owners who want to monitor their cars
For professional engaged in the work of police officers, journalists, detectives, lawyers, Taxi, etc.
Occasionally, if there is something unexpected happens on your way, you can record and share it on your website
What's more, as a picture & video enthusiast, you will never let beautiful scenery pass you by
Product Specification:
Recording resolution: 1280x960/720x480/640x480 pixels
Video format: AVI
Repeat storage by selection: 2/5/15 minutes
Power source: Built-in rechargeable battery or 12V/24V car charger
Supports SD/MMC card (From 1GB up to 32GB)
Built-in microphone
Mode: Video Recorder/Camera
2.5 inch LCD: 270°whirl
Language: English/Chinese/Japanese/Russian
Light Frequency: 50/60Hz
Interface: HDMI & USB2.0
Color: Black
Dimension: 105 x 61 x 20 mm

How do GPS Jammers Operate

When you see information on GPS Jammers, you may wonder what a GPS jammer is and what potential applications it may have.
GPS Jammers

Before explaining the how and what of GPS jammers it is best to explain how GPS works. GPS stands for Global Positioning System. It is used by individuals, commercial entities and the military, mostly for navigational purposes. GPS uses a system of satellites that orbit the earth and send radio signals. The GPS satellites work with a GPS receiver to determine positioning via triangulation. GPS can be found (and hence GPS jammers can be effective against) individual handheld units, car navigational and positioning systems, and boat navigational and positioning systems.

GPS operates using triangulation, which is a method in which three separate points are measured to calculate location. In a car's navigation system, the car's location is measured by three specific satellites orbiting the earth. Using triangulation, GPS can deliver the location to the receiver within inches of its exact location. It is important to note that GPS radio signals use a specific frequency. There are actually two major frequencies that GPS works on: one is for public, non-military use at 1575.42 MHz and one that is used solely for the US military at 1227.6 MHz. Because GPS is nothing more than radio waves, these waves can be jammed using a GPS Jammer, though technical devices and expertise are needed for that purpose.

While GPS jammers have been created (specifically by the government, military organizations and spy or privacy gadget companies), most civilians do not have the technical capabilities to create their own home made device. It is much more difficult than just blocking a radio signal with basic radio interference.

Most GPS jammers are built for military uses, for instance, to confuse the enemy on where their exact location is or where the enemies GPS guided missiles or bombs will fall. However, there are a few civilian uses for jamming GPS signals including the ability to conceal oneself or one's vehicle in the case that it is being tracked by a GPS receiver. A practical application of GPS jammer use by civilians would be a salesperson that would buy a GPS jammer.  The salesperson may want to have lunch outside their territory, or run home for a forgotten item, without having to do a lot of explaining due to GPS tracking on their vehicle. Most GPS jammers have a range of up to 10 meters, which will cover even the largest of vehicles.