Jack connector

Mono plug (TS)

SIG = Signal (tip)
GND = Ground (sleeve)

Stereo plug (TRS)

L = Left channel (tip)
R = Right channel (ring)
GND = Ground (sleeve)

Balanced mono (TRS)

+ = Positive phase (tip)
- = Negative phase (ring)
GND = Ground (sleeve)

Stereo plug 4-pole

L = Left channel (tip)
R = Right channel (ring)
AUX = Auxiliary signal (ring)
GND = Ground (sleeve)

Used by Nokia and in some old phones. Other devices use "Universal 4-pole cell phone headset" (AUX and GND are inverted)

Universal 4-pole cell phone headset

L = Left channel (tip)
R = Right channel (ring)
GND = Ground (ring)
MIC = Microphone & Control (sleeve)

Used in most cell phones and tablets (HTC, Samsung, Blackberry, Sony, Motorola, iPhone, iPod)

Audio/Video plug 4-pole

PinSonyPanasonicNokiaSamsung
1Left AudioRight AudioLeft AudioLeft Audio
2Composite VideoA&V GroundRight AudioRight Audio
3A&V GroundComposite VideoComposite VideoA&V Ground
4Right AudioLeft AudioGroundComposite Video


Color Codes (PC99 standard)

Green TRS 3.5mmStereo output, front channels or headphones
Black TRS 3.5mmStereo output, rear channels
Grey TRS 3.5mmStereo output, side channels
Gold TRS 3.5mmDual output, center and subwoofer
Blue TRS 3.5mmStereo input, line level
Pink TRS 3.5mmMono or stereo microphone input