An endoscope including a handle housing having apertures for legs of an operating part, an electrical switch positioned in the handle housing and having a carrier board having apertures for the legs. The operating part includes a finger pad having a finger surface, a ring connected to and extending from the finger pad, the ring having a plunger aperture, legs connected to and extending from the ring, the legs each having a spacer section and an electrical switch retention protrusion. The legs traverse the apertures of the handle housing and the carrier board to secure the electrical switch to the housing handle. The finger pad comprises elastically deformable material configured to extend toward and cause actuation of the electrical switch, when pressure is applied and to return to a rest position when pressure is released.

A keyboard is applied to mounting on a holding baseplate of a computer device and includes a plurality of keyswitches, a membrane circuit board and a baseplate. The membrane circuit board is disposed under the plurality of keyswitches. The baseplate is disposed between the plurality of keyswitches and the membrane circuit board and is connected to the plurality of keyswitches, so as to make the plurality of keyswitches movable relative to the baseplate for triggering the membrane circuit board. The baseplate has a plurality of hooks. The plurality of hooks passes through the membrane circuit board to be engaged with a plurality of engaging hole structures of the holding baseplate respectively, so as to detachably mount the keyboard on the computer device. A number of the plurality of hooks is greater than forty.