MB Quart QUB1.10201 QUBOne Portable Wireless Bluetooth Speaker with 5-Hour of Music, Blue A single 40mm neodymium driver in compact extruded aluminum housing for great sound in a very small portable unit Sticky silicone pad for increased stability and solid bass A built in noise cancelling microphone offers simple hands free conference calling 5 hour run time utilizing a 500mAh lithium polymer (LIPO) battery 2 hour recharge time