1.Excellent audio quality with powerful base 2.Reinforced Aluminum case 3.Support iphone, ipad,all of music ... rechargeable batteryHand rope design for easy portabilityTechnical specification ParameterValueBluetooth specification2.1+EDRBluetooth profile A2DP AVRCPRF Range10mFrequency Response100Hz-20KHz(X3/X3M) ... x5M)Weight120g(X3/X3M)190g(X5/X5M) bluetooth speaker with 2.1+EDR,ce,fcc,rohs certificated