Connector structure of waterproof and explosion-proof button

An apparatus, comprising:

• a housing;
• a circuit board configured in the housing;
• an actuator disposed on the circuit board;
• and
• a pushable connecting structure fixed on the housing by a threaded nut, wherein the pushable connecting structure further comprising:
• a hollow bolt having an externally threaded shank part, a first opening at the bottom of the externally threaded shank part, and a second opening at a head part of the hollow bolt, wherein a hollow portion of the hollow bolt has an internal threaded part extending from the first opening and a rod-accommodating portion extending from the second opening;
• a flexible waterproof cap, which seamlessly covers the head part of the hollow bolt, having a first rod and a second rod protruded from opposite surfaces of the flexible waterproof cap, wherein the first rod is substantially received in the rod-accommodating portion of the hollow bolt, and the second rod is moved to engage the actuator when a force is applied to the first rod from the first opening;
• and
• a removable screw, which is screw-fastened to the hollow bolt, wherein the removable screw mates with the internal threaded part and seals the first opening of the hollow bolt.