Cable is a general term for optical cables, cables, and other items. There are many uses for cables, mainly for controlling installation, connecting equipment, transmitting electricity, and other multiple functions. They are a common and indispensable thing in daily life

A relay is an electrical control device that causes a predetermined step change in the controlled quantity in the electrical output circuit when the change in input quantity (excitation quantity) meets the specified requirements. It has an interactive relationship between the control system (also known as input loop) and the controlled system (also known as output loop). Usually used in automated control circuits, it is actually an "automatic switch" that uses small currents to control the operation of large currents. Therefore, it plays a role in automatic regulation, safety protection, and switching circuits in the circuit.

Sensors are detection devices that can sense the measured information and transform it into electrical signals or other required forms of information output according to certain rules, in order to meet the requirements of information transmission, processing, storage, display, recording, and control. The existence and development of sensors have provided objects with senses such as touch, taste, and smell, making them come to life. Sensors are an extension of human facial features. Sensors have the characteristics of miniaturization, digitization, intelligence, multifunctionality, systematization, networking, etc. They are the primary link to achieve automatic detection and control. A new type of aluminum nitride sensor that can operate at high temperatures up to 900 ℃