Retractable Headset MONO Hands-free Earphone Mic Single Earbud Headphone In-Ear Wired [3.5mm] Black compatible with OnePlus Nord N20 5G. Fonus retractable earphones with a standard 3.5mm jack. These earphone will work on any standard digital audio device that uses a 3.5mm port, making the earphones extremely convenient and portable. No longer will you have to deal with the mess that is audio wires, simply pull and lengthen the wires when listening and retract when you are done. These retractable earphones are truly a great accessory for traveling and listening to music and being the perfect companion for your phone or iPod or MP4 player or laptop computer. Premium sound and voice quality. Excellent Bass Response. Comes in Bulk Packaging (Non-Retail Package).