Abstract: A housing for an electronic device includes a main body and a ventilated member fixed on the main body. The main body includes a heat dissipating zone. The heat dissipating defines a plurality of heat dissipating holes. The ventilated member defines a heat dissipating chamber communicating with the heat dissipating hole therein and a ventilated hole for introducing airflow into the heat dissipating chamber. The ventilated member forms a covering portion covering the heat dissipating holes.

Abstract: A mechanical strength tester includes a steel ball and a hollow cylinder including a supporting configuration. The diameter of the steel ball is less than the diameter of the cylinder. The supporting configuration is operable to support the steel ball on the top of the cylinder and release the steel ball to fall down in the cylinder under force of gravity.

Abstract: A group of trays is configured for storing and transporting workpieces. Each tray includes a base and a frame. The base includes a plurality of receiving portion for receiving the workpieces. The frame surrounds the base to form a cavity. A plurality of projections are formed at the outer side of the flange. When two trays are stacked whether in a same direction or opposite direction, the lower tray is partially received in the cavity of the upper tray, and the projections of the lower tray resist the frame of the upper tray to stop the lower tray from being further inserted into the cavity of the upper tray.

Abstract: Toothbrushes comprising components with light transmitting and structural characteristics provide enhanced visual and other sensory effects. The components in combination are generally chemically compatible and function to provide areas of varying visibility of features and optionally varying scent release.