The phrase "auxiliary jack" is correct and usable in written English.
It is typically used to refer to a secondary input/output port on electronic devices, such as audio equipment or smartphones.
Example: "Make sure to connect your headphones to the auxiliary jack for the best sound quality."
Alternatives: "aux jack" or "aux input".
Standard hookups include a U.S.B. port for an iPod, an auxiliary jack and two 12-volt outlets.
The projector has an auxiliary jack that would enable the use of external speakers, but that defeats the purpose of having a pocket projector.
Every switch works with precision, the stereo has an auxiliary jack to pump in music from an iPod and the instruments are easy to read.
There is also a 3.5mm auxiliary jack so you can use the base to amp up an iPod or other music player.
There's a clever auxiliary jack for plugging in an MP3 player or other electronic device, but it can be used easily only in daylight.
The TuneTalk is one of the first iPod peripherals to record in full 16-bit stereo, using its two discrete microphones or a separate mike plugged into its auxiliary jack.
Also, auxiliary jacks are found in 60% of 2007 models.
Keeping ornamentation to a minimum, the on-off switch is discreetly flush with the cabinet, as is the concealed auxiliary input jack.
Standard equipment on the SRT8 includes heated front seats, air-conditioning, many power amenities, cruise control, heated side mirrors, a 13-speaker audio system with six-CD changer, satellite radio, an auxiliary audio jack and steering-wheel-mounted audio controls.
The base SV comes with a surprisingly generous amount of standard equipment, including a navigation system and a six-speaker sound system with CD player, satellite radio, an auxiliary audio jack and an iPod-USB audio interface, Bluetooth connectivity and a trip computer.
Newer cars include an auxiliary input jack to connect different audio sources to the car's stereo.
