Abstract: A probe card is provided. The probe card includes: a main circuit board defining an opening; a fixed core provided on a bottom surface of the main circuit board; a movable core provided adjacent the fixed core and configured to move through the opening along a vertical direction; and a driver provided on an upper surface of the main circuit board and configured to control the movable core to move along the vertical direction. The driver includes a driving source provided on an installation portion of the main circuit board, and a power transmission member connected to the driving source and including a roller configured to contact the movable core, and the driver is configured to move the movable core to control whether the fixed core or the movable core is electrically connected to a product, according to a type of the product.

Abstract: A connector assembly includes a socket connector with a transformer circuit and a plug connector that is releasably fit to the socket connector. The plug connector includes a slidable power switch containing a magnet and a magnetic detection element that detects the magnetic field of the magnet. When the slidable power switch changes position to bring the magnet close to the magnetic detection element, a closed circuit is formed and a power supply is activated. When the magnet is moved away from the magnetic detection element, the circuit is open and the power supply is cut off. The plug connector has a front end with a rotatable water-tight collar. The socket connector includes a closure cap arranged at an end for temporarily engaging an external thread of the socket connector in order to protect the assembly when the socket connector is engaged with the plug connector.