The headphone mini jack, or tip, ring, and sleeve (TRS) connector, is a small, cylindrical audio connector that may plug a headphone set into a music player or other electronics device. Found in different standard sizes, this plug can be gripped by the fingers and inserted into conducting ports of equal sizes. Choosing a headphone mini jack is a matter of compatibility with existing equipment, and consideration of size, sound quality, and number of prongs needed. Varieties are commonly known as 1/8-inch, 2.5 and 3.5 millimeter (mm), multipronged, and universal serial bus (USB) types.
A wide assortment of differently sized plugs work on consumer and professional equipment. Larger plugs usually work on component equipment like stereos or public address systems, while mini 3.5 mm plugs are often found in common audio devices. This type usually services digital consumer electronics like cameras and portable digital video disc (DVD) players. Less commonly, 2.5 mm plugs service dedicated equipment like cordless or cell phones and two-way radios.
Considerations for choosing the best headphone mini jack can involve the quality of its line, and whether or not it is shielded to minimize electronic interferences. Jacks may vary in the quality of their audio reproduction. Some may offer stereo sound, and others sport gold-plated pins to make a solid connection and help ensure the clarity of sound quality.
The length of the cable may also factor in; it should be long enough to function without undue tugging, while not so long it gets tangled up. Additionally, the jacketing material of the line may vary in quality and durability. For wearable mini jack lines you may consider choosing one that resists tangling or curling.
Further, determine whether your mini jack requires an adapter to fit into a device. For example, you may wish to use it on an airline, which may use an older, dual-pronged design. An adapter will allow you to use your personal headset, which may be more comfortable or higher quality than the one provided by the airline. It's not uncommon to use the same set of headphones for different devices, such as music players or cell phones. Numerous adapters exist to accommodate connections of different sizes: for example, going from a 2.5 mm to 3.5 mm plug.
Some headphone mini jack products feature dual-pronged designs, while others permit going from the mini jacks to the full-sized jacks of home stereo components. Right-angled types are bent to minimize wear and tear from impacts. Depending on its design, it may place all of its pins and ports on a single unit, or attach independent jacks to a single or multiplug line. Additional components can include cable wraps that allow you to coil excess cable, and in-line remotes with volume and mute controls. These may also feature clips to help secure the line to a pocket or jacket.
In addition to cable, wireless varieties also exist. For attachment to laptops and computers, multipronged types combine headphone and microphone plugs. They may also transmit digital information with USB plugs. With such a wide assortment of sizes and types of headphone mini jack products, it pays to give a little thought to this small component; after all, it may carry inside a vast sound space.