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Official Samsung Galaxy S9 Plus Tuned By AKG In-Ear Earphones
Behind the Head Dual 2 way radio headset
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Motorola MOTOROKR S9 Bluetooth Stereo Headphones | Headphone Reviews and Discussion - Head-Fi.org
JBL S9 Sports Wireless Stereo Headphones
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Yes, the Samsung Galaxy S9 has a headphone jack - The Verge