Listen to tunes all day with these Sony earphones. Downloading the free Smart Key app to your compatible device lets you customize their functionality, and the lightweight, in-ear design lets you can wear them comfortably during a long commute or workout. These Sony earphones come with small, medium and large earbuds for a personalized fit. 9mm neodymium drivers for dynamic sound The high-energy 9mm dome-type neodymium drivers produce powerful balanced sound in the 8Hz-22kHz range. Integrated microphone and smartphone playback control The integrated microphone and multi-function control button make the perfect companions for your smartphone. Smart Key app Android users can also enjoy the convenient Smart Key app for added control functionality directly from your smartphone. Comfortable secure-fitting silicone earbuds The hybrid silicone earbuds provide long-lasting comfort and a secure fit. Small, medium and large sizes are included. Lightweight design The lightweight design makes for easy portability and almost feels like you are not wearing headphones at all. Fashionable and colorful Choose from a variety of colors to suit your style. 3.5mm connector Enables flexible connection options.