Abstract: A piezoelectric material member includes a piezoelectric body, an upper electrode and a lower electrode. The upper electrode and the lower electrode are disposed on different sides of the piezoelectric body. The upper electrode has a first upper electrode section and a second upper electrode section separated from the first upper electrode section. The lower electrode has a first lower electrode section and a second lower electrode section separated from the first lower electrode section. The first lower electrode section is coupled to the first upper electrode section, so that the piezoelectric body generates a first frequency via the first lower electrode section and the first upper electrode section. The second lower electrode section is coupled to the second upper electrode section, so that the piezoelectric body generates a second frequency via the second lower electrode section and the second upper electrode section.

Abstract: A foldable box, which is formed from a package panel, includes a bottom board, four side boards on four sides of the bottom board, two top boards on two of the side boards at opposite sides, and two connecting boards on the other two side boards. Each side board has two foldable wing pieces at opposite sides. The side boards fold upwardly to engage the wind pieces with the wind pieces of the neighboring side boards. The engaged wind pieces are overlapped and respectively form into a flat portion at junctions of the side boards. The foldable box may be assembled and disassembled in an easy and fast way.

Abstract: A waterproof cable connector has a body, two plugs and at least one sealing ring. The body has a chamber and two through holes communicating with the chamber. The plugs are respectively connected to the body via the through holes and each plug has a clamping ring and a securing fastener. The clamping ring is mounted in the body and has multiple grooves and multiple tabs. The securing fastener is mounted around the clamping ring to press the tabs of the clamping ring. The at least one sealing ring is elastic and waterproof and is mounted between separate parts on the body to prevent water from permeating the chamber of the body.

Abstract: A waterproof cable connector has a body, two plugs and at least one sealing ring. The body has a chamber and two through holes communicating with the chamber. The plugs are respectively connected to the body via the through holes and each plug has a clamping ring and a securing fastener. The clamping ring is mounted in the body and has multiple grooves and multiple tabs. The securing fastener is mounted around the clamping ring to press the tabs of the clamping ring. The at least one sealing ring is elastic and waterproof and is mounted between separate parts on the body to prevent water from permeating the chamber of the body.