The different screen sizes which the device can work with.

The maximum length at which an image can be projected.

A property of a display system, defined as the ratio of the luminance of the brightest color (white) to that of the darkest color (black) that the system is capable of producing.

Le rapport d'aspect est le rapport entre la largeur d'une image et sa hauteur. Le rapport d'aspect natif est celui pour lequel le projecteur/écran est particulièrement conçu. Les images affichées dans leur format d'origine utiliseront toute la résolution de l'écran et atteindront une luminosité maximale. Les images affichées dans un format autre que le format d'origine auront toujours une résolution et une luminosité moindres que les images affichées dans le format d'origine.

The characteristics of the lamp.

Measure of how strongly the system converges or diverges light. For an optical system in air, it is the distance over which initially collimated rays are brought to a focus. A system with a shorter focal length has greater optical power than one with a long focal length; that is, it bends the rays more strongly, bringing them to a focus in a shorter distance.For an optical system in air, the effective focal length (f and f′) gives the distance from the front and rear principal planes (H and H′) to the corresponding focal points (F and F′).

Aperture range of the lens of the camera, expressed in f-stops

Measures how much the camera can adjust its focus for distance shots. A 3x zoom ratio changes the camera's focal length by a factor of three, from 35 mm to 105 mm for example.

The supported protocols for exchanging analog signals.

Full High Definition (HD) means that a display supports a resolution of 1920 x 1080 pixel, and has a digital TV connection.

The device can be used with 3D technology.

The graphic resolutions that can be displayed by the device. The graphic resolution describes the width and height dimensions of a display, such as a computer monitor, measured in pixels.

Number of USB 2.0 ports (connecting interfaces) in the device. USB 2.0 was released in April 2000 (now called "Hi-Speed"), adding higher maximum signaling rate of 480 Mbit/s (effective throughput up to 35 MB/s or 280 Mbit/s), USB 2.0 ports are usually black.

The two sockets (ports) for receiving left audio signal (white cable) and right audio signal (red cable).

The socket where a microphone is connected to the device.

The socket (port) to receive input from a PC via a D-sub, which is a connector with a characteristic D-shaped metal shield.

Number of VGA (D-Sub) ports (connecting interfaces) in the device. The VGA (D-Sub) connector is a 15 pin connector between a computer and a monitor. It was first introduced in 1987 by IBM.

The number of sockets (ports) for HDMI connections. HDMI (High-Definition Multimedia Interface) is a compact audio/video interface for transferring uncompressed video data and compressed/uncompressed digital audio data from a HDMI-compliant device ("the source device") to a compatible computer monitor, video projector, digital television, or digital audio device. HDMI is a digital replacement for existing analog video standards.

The socket (port) for the composite video input (white cable).

Digital Visual Interface (DVI) is a video display interface to connect a video source to a display device, such as a computer monitor.

An Ethernet LAN (Local Area Network) interface is present, for a wired conection via a cable.

Number of Ethernet LAN (RJ-45) ports (connecting interfaces) in the device. Ethernet LAN (RJ-45) ports allow a computer to connect to the ethernet.

The amplitude level of the undesired background noise, usually measured in decibels (db).