TecBillion Arc-triangle Bluetooth 3.0 Portable Wireless Speaker, with 2 Loudspeaker, Total 6W Output Power with Bass and Stereo Sound, Build in Microphone for Handfree Phone Call, Blue High quality crystal clear sound distinct mids and highs from our two acoustic drivers delivering total 6 Watts (3W per loudspeaker) of excellent stereo sound and enhanced bass. Volume can be adjusted via rotating. Bluetooth 3.0+EDR ensure a stable connection within 10 meters (barrier-free), connect in seconds to any Bluetooth-enabled devices including: iPhone, iPad, iPod, Samsung, Kindle, Smartphones, Tablets; play audio from laptops, PCs, and non-Bluetooth devices using included 3.5mm audio cable/AUX-IN jack. Built-in MIC for handsfree speakerphone phone calls from smartphones and iPhones, so you can conveniently pick up a call by this speaker in car, bathroom, cooking, or hiking etc. High capacity rechargeable 2000 mAh battery for up to 8-10 hours of playtime; designed to be comfortable to carry with no square edges, so much better for travel & hiking, lightweigth and easy to fit in your backpack, suitcase, or a travel bag. Support TF card-it could automatically play the music with a stand alone Micro SD card. With a helpful voice prompts to help guide you through the speaker's different modes and settings.