There are provided an oxygen scavenger composition and the like, which are excellent in economy in which the amount of oxygen absorbed per unit volume of the oxygen scavenger composition is large, and rusting at high humidity is inhibited. There is an auxiliary arm that is provided with an engagement surface that engages underneath the edge of the roof. The proximal end of the core is coupled to a positioning mechanism within the catheter handle and the distal end of the core floats within the catheter sheath. When the operating interface is continuously pressed for a second particular period of time, the control unit recognizes the identity of the wireless mouse via the wireless communication module and the receiver.