Establishments primarily engaged in packaging, repackaging, and bottling of purchased chemical products, but not engaged in manufacturing chemicals and allied products, are classified in Wholesale or Retail Trade industries.
A phone connector, also known as phone jack, audio jack, headphone jack or jack plug, is a family of electrical connectors typically used for analog audio signals. The phone connector was invented for use in telephone switchboards in the 19th century and is still widely used. The phone connector is cylindrical in shape, with a grooved tip to retain it. In its original audio configuration, it typically has two, three, four and, occasionally, five contacts. Three-contact versions are known as TRS
Plugging in a headset, microphone or speakers. Speakers, microphones and headsets have one of two types of plug: mini jack plugs or a USB plug. Mini-jack plugs look like typical headphone plugs. You'll have two plugs which have corresponding ports on your computer. Mini jacks come in different styles. Some are color-coded with one pink or black with a pink band and one green or black with a green band. Others have symbols with a microphone symbol on one jack and a headphone symbol on the other.