LCD projectors create images through a liquid crystal display and are the most modern form of projection equipment. Overhead projectors are older projectors for hard copy transparencies.
DLP, or Digital Light Processing projectors are of the same generation as LCD and offer high quality resolution and brightness.
CRT projectors are older technology and based on three color light projection.
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This describes the type of wire connection the phone uses to connect to other network devices. Make sure this type is compatible with existing network devices.
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This is the size and quality of the video image possible using this phone. Image quality depends on the number of pixels, the higher the number the better the quality of the image.
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Display size is the size of the screen. A bigger screen may be more convenient to use, but it will also increase the overall weight of your computer. Screens are measured diagonally across the screen.
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IP Phones often come with attached keyboards. This is the type of keyboard your IP phone has. Numeric keyboards have only numbers, whereas alpha-numeric have both letters and numbers. QWERTY keyboards are standard layout typing keyboards.
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This is how the device gets power. Many devices are powered through their connection to the network (for example, through the USB cable). Others are powered through an AC adapter.
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