Abstract: The present invention discloses a respiratory mask to connect a user and a breathing tube for receiving a first gas and releasing a second gas, so as to provide an user's respiratory system to exchange gas. It comprises a main part, an air chamber exchange part, an insert and a clamping part. The main part provides a first, second, and third openings that are communicated each other. The first opening connects to the breathing tube to receive the first gas from the breathing tube. The air chamber exchange part provides an exhaust assembly to relieve pressure according to an internal air pressure of the air chamber exchange part. The insert connects to the user's nose so as to direct the first gas to the user or direct the second gas from the user to the air chamber exchange part. The clamping part connects to the user's mouth.

Abstract: A device for the rapid and convenient mounting of an electronic product on a supporting rack includes a holding rack, an engaging element, and a lock mechanism. A holding plate of the holding rack engages a first edge of the supporting rack, and holds the electronic product. An extension plate with first position and second position holes is connected to the holding plate, and the engaging element can pivot on the holding plate. The lock mechanism disposed on the engaging element can be selectively inserted into the first position hole and the second position hole. When the electronic product is mounted on the supporting rack, the lock mechanism is inserted into the first position hole, the holding plate is engaged with the first edge, and the engaging element is engaged to a second edge of the supporting rack.

Abstract: A device for the rapid and convenient mounting of an electronic product on a supporting rack includes a holding rack, an engaging element, and a lock mechanism. A holding plate of the holding rack engages a first edge of the supporting rack, and holds the electronic product. An extension plate with first position and second position holes is connected to the holding plate, and the engaging element can pivot on the holding plate. The lock mechanism disposed on the engaging element can be selectively inserted into the first position hole and the second position hole. When the electronic product is mounted on the supporting rack, the lock mechanism is inserted into the first position hole, the holding plate is engaged with the first edge, and the engaging element is engaged to a second edge of the supporting rack.