MBQUART QUBThree Dual Driver Wireless Bluetooth Speaker (Blue) Dual 40mm neodymium drivers in a custom enclosure to generate vibrant sound with deep and loud low bass Single racetrack passive radiator for extending bass frequencies CSR BT4.0 chipset with 6 watt (3.7V) amplifier A built in noise cancelling microphone offers simple hands free conference calling 10 hour run time 1250mAh lithium polymer (LIPO) battery