Retractable Headset Hands-free w Mic Dual Earbuds Earphones Wired Headphones 3.5mm [White] compatible with T-Mobile REVVL 5G, 4, Plus. Fonus retractable earphones with a standard 3.5mm stereo jack. These earphones will work on any standard digital audio device that uses a standard 3.5mm port, making the earphones extremely convenient and portable. No longer will you have to deal with the messy 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, tablet or iPod or MP4 player or laptop computer! You need to pull the wires from both sides at the same time to retract and expand. DO NOT pull wires only on one side. Comes in Bulk Packaging (Non-Retail Package).