Sennheiser CX 275 S Universal Mobile Headset Universal compatibility with virtually any smartphone on the market featuring a 3.5 mm headphone jack, including Android, Windows Mobile, RIM (Blackberry) and iOS devices.Connectivity Technology: Wired Signature Sennheiser sound delivered by high powered dynamic drivers for great bass-driven stereo sound Ear adaptors in different sizes deliver excellent fit and comfort while providing ambient noise attenuation Integrated mic and smart remote for easy management of calls and music tracks 2 year global warranty