Low profile 3.5mm stereo audio jack.
Audio Adapter - 1/4 to 3.5 mm Stereo - COM-11149 - SparkFun Electronics
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3.5mm Audio Jack Adapter - RobotShop
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Wholesale Stereo 4p Jack 3.5mm Products at Factory Prices from Manufacturers in China, India, Korea, etc.
3.5mm Audio Jack Adapter - RobotShop
SparkFun – Audio Jack Breakout – Audio Jack 3.5mm
3.5mm Audio Jack Adapter - RobotShop