| Telephone | An instrument that converts voice and other sound signals into a form that can be transmitted to remote locations and that receives and reconverts waves into sound signals. |
| Optical Fiber | A flexible optically transparent fiber, usually made of glass or plastic, through which light can be transmitted by successive internal reflections. |
| Leather Case | A case made of leather material, dressed or tanned hide. |
| Walkie Talkie | A hand-held portable, two-way radio transceiver. |
| Wireless Phone | A long-range, portable electronic device used for mobile communication. |