Product Description 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. Packaging SpecsLength: 5.29 inches Width: 3.84 inches Height: 2.33 inches Weight: 10.21 oz COMES WITH extraordinary features 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