Abstract: A wireless charging device includes a casing, a wireless charging module, and an air-flow generator. The casing includes a housing part and a carrier plate disposed in the housing part to divide internal space of the housing part into a first accommodation space and a second accommodation space. The casing has an air inlet, an air outlet, and an opening. The carrier plate has a through hole. The air inlet, the air outlet, the opening, and the through hole are in fluid communication with the first accommodation space and the second accommodation space. The wireless charging module is located in the first accommodation space for charging a mobile device supported by the carrier plate. The air-flow generator is located in the first accommodation space for creating an airflow flowing through the air inlet, the second accommodation space, the through hole, the first accommodation space, and the air outlet.

Abstract: A baseball pitch-training apparatus includes a first-sampling region, second-sampling region, and a microprocessor. The first sampling region further includes a plurality of vertical and horizontal sampling units respectively along the vertical direction and the horizontal direction at the front edge of the home plate. The second sampling region is located in the rear of the first sampling region and also includes a plurality of vertical and horizontal sampling units. The sampling units of the present invention are used to generate position signals of a passing ball that will be forwarded to the microprocessor for further parsing the speed and the trajectory variation of a pitched ball, and determining whether or not the ball passed a strike region.