Optoma EH330UST data projector

The measurement of a display’s diagonal, expressed in inches or centimeters. It indicates the overall visual area available for content and is commonly used to compare monitors, televisions, laptops, tablets, and other electronic devices.

The main illumination source used by the product, such as LED, laser, CCFL, or other light-emitting technologies. It indicates whether the device uses a single light source or multiple sources and helps users understand the lighting characteristics of the item.

The electrical power output of each built‑in speaker in the product, expressed as a pair of values (e.g., "2 x 10 W" meaning two speakers each rated at 10 W). This attribute helps users compare audio performance and understand the power capacity of integrated speakers.

The chemical composition of a battery that determines its performance, energy density, and suitability for different applications. Common chemistries include Lithium‑Ion, Nickel‑Metal Hydride, Alkaline, Lead‑Acid, and others.