1,with CE,ROHS,ISO etc 2,professional amplifier,with USB,TF,MPS input 3,several colors to selection:black,red Specifications: Output Power: 28W Frequency Response: 50HZ ~ 10,000 HZ + 1dbConsumption Current: 150mAVoltage: DC 7.5, li-ion batteryBattery Type: Lithium BatterySize:105x55x140 mmThe amplifier speaker is engineered for enriched sound reproduction and has a highly steady operating ...