Creative Muvo 20 Portable Wireless Bluetooth Speaker with NFC, Amp and Dual Flared Bass Port (Black) Tap & Play NFC technology for fuss-free and easy usage High performance wireless playback with aptX high definition codec support - sounds as good as a wired connection Biggest sound in its class, with two powerful 3-inch full-range drivers, high output amplifier and advanced dual flared bass port tube Built-in rechargeable battery with more than 10 hours of playtime on a single charge plus a battery bank feature allowing you to charge your smartphone Built-in microphone intuitively switches from music to phone conversation and back again