Plantronics Mobile Phone Flex Grip Flex Headset with Noise Cancelling Technology. 2.5mm Headset compatible with ALL 2.5mm & 3.5mm adapter included to fit ALL 3.5mm audio ports. Ear Sponge for extreme comfort included. Can be used in either ear. The Flexible hook on the bottom holds Headset to your ear over the earlobe. Works on Apple, Samsung, HTC, LG, Sony, Blackberry, Boost, Nokia and many many more model landline phones, system phone, wireless phones, mobile phones, smartphones and or tablets. Beautiful, slick and most of all, COMFORTABLE