The trebl portable bluetooth speaker is ideal for home, camping trips, holidays or the beach, delivering a clear crisp stereo sound. with a built-in microphone for conducting hands-free calls or conferences, the trebl portable bluetooth speaker is ideal for wirelessly streaming music from your smartphone, tablet, ipod, mp3 player or laptop. the trebl portable bluetooth speaker has a usb slot for charging the internal battery, aux port, micro sd slot and fm radio functionality.