Flat Wired Headset MONO Hands-free Earphone w Mic Single Earbud Headphone [3.5mm] [White]. Fonus flat cable earphone with a standard 3.5mm jack. This 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 cable mess and ties, thanks to its flat cable design this headset will not tangle. This mono headset is truly a great accessory for traveling, in the car or in the office for a hands-free talk. Comes in Bulk Packaging (Non-Retail Package).