Abstract: An exemplary key includes a main body and a glazed layer. The main body has a contact receiving surface. The glazed layer is formed on at least one part of the contact receiving surface of the main body. The main body is made of ceramic materials. A method of making the present key is also provided.

Abstract: An exemplary optical connector 200 includes a first housing 20 and a second housing 24. The first housing 20 includes a main body 201. The main body 201 is elongated and hollow. One end of the main body 201 forms a resisting member 203 and the other end of the main body 201 forms a lock receiving portion 205. At least one latch hole 2051 is defined in the lock receiving portion 205 and at least one joint line 208 is formed in the lock receiving portion 205 adjacent to the at least one latch hole 2051. The extending direction of the joint line 208 is perpendicular to the longitudinal direction of the first housing 20. One end of the second housing 24 forms a lock portion 242 configured for engaging with the lock receiving portion 205. The lock portion 242 forms at least one protrusion 2423 configured for engaging with the latch hole 2051.

Abstract: An exemplary push button (10) includes a main body (12) made of a ceramic material; and a connecting portion (14) integrally formed with the main body. The push button has an improved performance and is scratch resistance.