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. • Microboom Speaker Boombox Portable Bluetooth Speaker • 24" stainless steel gold plated necklace • Bluetooth & TWS Pairing • Two 31MM Multi-media speakers • Passive bass radiator • MicroSD Card Reader • Call Answering • Playtime up to 8 hours on a full charge. • Rechargeable LI-ION battery • Power Supply: DC 3.7V / 500mAH • USB Charging Cable • Weight 3.7oz • 10 watts max power