... ,with ROHS,CE,ISO certificate 2,the leader of amplifier and speaker Whether you're a teacher, lecturer, ... great choice!Material: ABS Engineering Plastic,Meet ROHS ComplianceOutput Power: 15WFrequency Response: 100HZ-13.000HZ+1db Current Consumption: ... BatterySize: 100x80x35 mmWeight:258g Impedance:4ohmFeatures: How loud is the Amplifier? (dB ) Three color to selection: Black,Red,WhitePackage include:1 ...