Abstract: A structure for holding a battery on an automated guided vehicle (AGV) so as to allow easy and convenient battery replacement includes two fixed supports and a bracket. The bracket is connected between the two supports and each support defines a vertical groove and two horizontal grooves. Two sliders at the ends of the bracket are insertable into either horizontal groove. The two sliders can move down along the vertical groove together until the bracket makes contact with the battery and holds it in place. The two sliders can move up along the vertical groove and sideways into the horizontal grooves, thereby unlatching and releasing the battery for rapid replacement. An AGV using the structure is also disclosed.

Abstract: Sensible wired earphones are electrically connected with information equipment and contain: at least one body, a controller, and a telecommunication connector. Each of the at least one body includes a sensing unit, a micro-control unit, a casing, and a speaker. The sensing unit is configured to acquire user's photoplethysmography (PPG) signals, the micro-control unit is electrically connected with said each body, the sensing unit, and the telecommunication connector which is electrically coupled with the information equipment. The micro-control unit is configured to process and analyze the user's PPG signals, and the user's PPG signals are processed and analyzed by the information equipment. The controller includes a controlling interface electrically connected with the micro-control unit, the controller is electrically in connection with the telecommunication connector via a first electric wire, and said each body is electrically connected with the micro-control unit via a second electric wire.

Abstract: A dual audio earphone contains: an enclosure and a speaker unit. The enclosure includes a first chamber in which the speaker unit is housed, between a sound output end of the speaker unit and the enclosure is defined a cavity, the enclosure also includes a sound hole, and the speaker unit includes a holder, a dynamic speaker, a piezoelectric speaker, and a circuit unit. The holder has a bottom, a peripheral fence surrounding the bottom so as to form a second chamber, and an opening. The piezoelectric speaker is housed in the opening, and between the piezoelectric speaker and the sound hole is defined the cavity. The dynamic speaker is accommodated in the second chamber and is located between the piezoelectric speaker and the bottom, and the circuit unit is arranged outside the holder and is electrically connected with the dynamic speaker and the piezoelectric speaker.