Portable Bluetooth speaker Powerful bass, crisp highs Stereo sound output SIRI/speakerphone function Powerful speakerphone : has a built-in microphone that lets you enjoy hands-free calls and video chats using Skype, Google HangoutsTM and FaceTime. Whether you're in a conference room or cooking in the kitchen, your conversations will come through loud, crisp and clear. Enhanced bass Technology. Two powerful 40mm Drivers deliver crisp clean sound with deep bass. More features Compatible with smartphones, Tablets, and computers letting you send your favorite songs wirelessly to the speaker. Built-in Li-Ion Rechargeable Battery for up to 3 to 4 hours of playtime.