Stemless operation mechanism with a preferred waterproof function

A stemless operation mechanism applied to a watch and having a waterproof function, the stemless operation mechanism comprising:

• a case comprising a first accommodating area, a second accommodating area and a partition portion, the partition portion being disposed between the first accommodating area and the second accommodating area to provide an airtight isolating function;
• a first moving component movably disposed on the first accommodating area and comprising a first magnetic unit;
• a second moving component movably disposed on the second accommodating area and comprising a second magnetic unit located on position corresponding to position of the first magnetic unit, the second magnetic unit being cooperated with the first magnetic unit to generate a magnetic attraction force or a magnetic repulsion force;
• and
• a detection module disposed adjacent to the second moving component, and adapted to detect a movement of the second moving component for determining an operation behavior applied for the first moving component.