Button, button assembly and alert device

An alert device, comprising:

• a button assembly, comprising:
• a casing, having a first through hole and a plurality of second through holes;
• a button, comprising a pressed part, an activation part and a plurality of hook parts, wherein the pressed part has a central portion and a non-central portion, the non-central portion is connected to the central portion, the activation part is connected to the central portion, the plurality of hook parts are connected to the non-central portion, the activation part is disposed through the first through hole, each of the plurality of hook parts is respectively disposed through each of the plurality of second through holes, and the plurality of hook parts are connected to the casing;
• and
• a mount piece, mounted on the casing, wherein the plurality of hook parts are disposed through the mount piece and are directly engaged with the mount piece;
• and
• an alert switch, disposed corresponding to the activation part.

A button, comprising:

• a pressed part, having a central portion, a non-central portion and an outer annular edge, wherein the non-central portion is connected to the central portion, and the outer annular edge is connected to the non-central portion;
• an activation part, connected to the central portion;
• and
• a plurality of hook parts, connected to the non-central portion, wherein a distance from each of the plurality of hook parts to the activation part is greater than a distance from each of the plurality of hook parts to the outer annular edge;
• wherein each of the plurality of hook parts comprises a connection arm and a hook structure, the connection arm is connected to the non-central portion of the pressed part, and the hook structure protrudes from the connection arm, an extension direction of the connection arm from the non-central portion is different from a protruding direction of the hook structure from the connection arm, and a length that the hook structure protrudes from the connection arm is equal to or larger than 0.8 mm.