The Bumpboxx MicroBoom is a portable Bluetooth Speaker that seamlessly blends fashion & technology. Weighing in at only 3.7 ounces & smaller than a smart phone & much louder. The MicroBoom has the option to be worn on a necklace for hands free use. Connect to your bluetooth or use the SD card slot. You can Sync two units wirelessly in TWS mode giving you a left & right channel.