iRULU Portable Mini Wireless Bluetooth Speaker Built-in Microphone Black Working Time 6 Hours, supports 10 meters wireless transmission. Wireless Music Streaming via New Bluetooth v3.0 Technology. Built-in microphone, hands free function, anwser your call without delay, built-in TF card slot support MP3 music play Cancelled annoyed voice announcement, enhanced bass. Comes with 1 year warranty, 90 days return & refund.