Yealink EXP39 RJ-12 Voice Network Module

The physical interface or port used to connect a device to another component or system, such as USB, HDMI, RJ‑45, 3.5 mm jack, or fiber optic connectors. It indicates the shape, pin count, and electrical characteristics that determine compatibility with cables, adapters, and peripherals.

The linear measurement of an object from front to back or top to bottom, expressed in a physical unit such as millimeters, centimeters, inches, etc. It indicates how deep the item is and can be used for fitting, compatibility, or spatial planning.

The vertical dimension of a product measured from its lowest to highest point. It is expressed in a physical unit such as millimetres, centimetres or inches and applies to any item where height is relevant, including books, electronics, furniture and other objects.

The total count of physical connector ports present on a product, regardless of type or function. This value indicates how many separate interfaces (such as USB, HDMI, Ethernet, audio jacks, etc.) are available for connecting peripherals or other devices.

The range of relative humidity (in percentage) within which the product is designed to operate reliably. Values are expressed as a minimum–maximum interval such as "20 - 80 %" and indicate the acceptable environmental moisture level for optimal performance.

The mass of the product expressed in a standard unit such as grams or kilograms. It represents how heavy the item is and can be used for shipping calculations, handling instructions, or consumer information.

The horizontal measurement of a product, expressed in a linear unit such as millimetres or inches. It indicates how wide the item is from one side to the other and is used for sizing, fitting, and compatibility purposes.