Abstract: An electronic apparatus has an electronic module and a connection assembly. The electronic module has a first housing and a first connection portion. The first connection portion is recessed in the first housing and has a first magnetic attraction element and a first buckle assembly. The first buckle assembly is disposed on ends of at least one diagonal line of the first connection portion. The connection assembly is detachably connected with the electronic module and has a second housing and a second connection portion. The second connection portion is formed as a protrusion corresponding to the recessed first connection portion in shape, and has a second magnetic attraction element and a second buckle assembly. The second buckle assembly is disposed on ends of at least one diagonal line of the second connection portion and is detachably engaged with the first buckle assembly.

Abstract: An electronic apparatus has an electronic module and a connection assembly. The electronic module has a first housing and a first connection portion. The first connection portion is recessed in the first housing and has a first magnetic attraction element and a first buckle assembly. The first buckle assembly is disposed on ends of at least one diagonal line of the first connection portion. The connection assembly is detachably connected with the electronic module and has a second housing and a second connection portion. The second connection portion is formed as a protrusion corresponding to the recessed first connection portion in shape, and has a second magnetic attraction element and a second buckle assembly. The second buckle assembly is disposed on ends of at least one diagonal line of the second connection portion and is detachably engaged with the first buckle assembly.

Abstract: An electronic apparatus has an electronic module and a connection assembly. The electronic module has a first housing and a first connection portion. The first connection portion is disposed on and recessed in a rear surface of the first housing and has a first magnetic attraction element and a first buckle assembly. The first buckle assembly is disposed on two sides of the first connection portion. The connection assembly is detachably connected with the electronic module and has a second housing and a second connection portion. The second connection portion is disposed on the second housing, is formed as a protrusion corresponding to the recessed first connection portion in shape, and has a second magnetic attraction element and a second buckle assembly. The second buckle assembly is disposed on two sides of the second connection portion and is detachably engaged with the first buckle assembly.

Abstract: A front-and-rear-facing camera device has a camera unit mounted on a selected position on a carrier. The camera unit has a front lens and a rear lens oppositely mounted on a lens-mounting base to take a front-view video stream and a rear-view video stream, and displays the front-view and rear-view video streams on two non-overlapping display areas of a display, or displays the front-view video stream on an overlapping display area of the display and the rear-view video stream on the displayed front-view video stream through an image-processing circuit and a signal transmission interface electrically connected between the front and rear lenses and the display.

Abstract: A downhole positive displacement motor converts hydraulic fluid pressure into rotational torque. The motor includes a non-helical rotor and stator, and upper and lower valve assemblies each comprising cylindrical rotating and stationary elements which define longitudinal passages. The timing of alignment of the passages creates pressure in power pockets in the stator, rotating the rotor. The rotational torque can be used in any application that may require mechanical force to operate or drive a mechanism created for oil, gas, or water production in a down hole application.