SmartSound is a speaker screened from 3W, high quality with Bluetooth V3.0 + EDR connection via cable and is able to read micro SD cards. It has a rechargeable battery via Micro USB connection and voice signals Power Connection Pairing (Pairing) and Off. It has a built-in microphone for handsfree use. During playback, when a call arrives, the music is automatically paused and resumed at the end of the call. Ideal for Tablet, Smartphone, MP3, MP4, etc.