Sony Premium Lightweight Noise Cancelling Wireless Surround-Sound Walkman MP3 player Headphones with Built-in SpeakerThe Sony 3-in-1 Premium Lightweight Wireless Headphones provide high-quality audio in a lightweight and comfortable package that's ideal for life on-the-go. The Extra Bass Headphones utilize 40mm dynamic dome drivers and special acoustical earcup enclosures to deliver an extended balanced, and accurate sound reproduction for an exceptional listening experience.Wearable 3-in-1 WalkmanWherever you are, whatever you’re doing, choose how you listen to music. The powerful Wireless headphones are also a personal speaker system and an MP3 player, giving you more options as to how you listenWireless headphonesThis one-piece music player’s unique design is lightweight, ideal for sports and active lifestyles. It allows you to be wire-free, hands-free, and without distractionSurround-Sound speakersAt a single touch you can play music in surround sound from the outward facing speakersBuilt-in MP3 playerThe Sony Stereo Headphones may be compact in size but can store hours of music thanks to the internal 16GB memory, With 16GB storage capacity you'll be able to store up to 4,000 of your favourite songsQuick charge batteryA built-in rechargeable battery provides up to 20 hours of use, and can be charged with the included micro-USB cable. When you're in a hurry, a 3-minute quick charge gives up to 60 minutes of listening timeTransfer from Mac OS or WindowsWhether you use a Mac or a PC, transferring music is easy Create your favorite playlists in iTunes or Windows Media Player and drag them to the music playerConvenient OperationEasy-to-reach volume and built-in monitor function on the Headphone allows you to control your music without taking off the headphones