Abstract: A respiratory mask includes: a mask body for covering a part of a user's face; left and right wing portions, extending respectively from two opposite sides of the mask body and each having a rear surface adapted for attachment to the user's face; and an adhesive layer formed on the rear surfaces of the wing portions.

Abstract: A respiratory mask includes: a mask body for covering a part of a user's face; left and right wing portions, extending respectively from two opposite sides of the mask body and each having a rear surface adapted for attachment to the user's face; and an adhesive layer formed on the rear surfaces of the wing portions.

Abstract: The circuit support apparatus of the invention includes a pivot mechanism, two arms and a circuit holder connected to one of the arms. The pivot mechanism includes a stationary ring, a rotary ring correspondingly connecting with the stationary ring and being capable of rotating with respect to the stationary ring, a ratchet gear, a push button connecting with the ratchet gear. The rotary ring has a plurality of first teeth. The ratchet gear has a second tooth only being rotated with respect to the first teeth in one direction. The arms are respectively connected to the stationary ring and the rotary ring. When the push button is pushed, the second tooth is shifted out of mesh with the first teeth, and the rotary ring with one arm is rotatable with respect to the stationary ring with the other arm. It is quite safe and convenient for users.