SPECIFICATIONSWoofer/Widerange material: PaperWaterproof: YesVoice Control: NoUse: HomeTweeter type: ConeTweeter material: OtherTotal Harmonic Distortion: 1%Support Memory Card: NoSupport Apt-x: NoSupport APP: NoSpeaker Type: PortableSensivity: 97dBSabwoofer cabinet material: PlasticRemote Control: NoPower Source: Battery,USBPMPO: 20WOutput Power: 6WNumber of Loudspeaker Enclosure: 2Mid-range material: PaperMaterial: PlasticInput Power(W): <25 WImpedance: 4 OhmFrequency Range: 65Hz-20KHzFeature: Phone FunctionDisplay Screen: NoDisplay Screen: NoControl: Volume control,Playback,EQCommunication: bluetoothCodecs: sbcChannels: 2 (2.0)Certification: CE,FCC,RoHSCabinet Material: PlasticBuilt-in Microphone: YesBrand Name: ANKERBluetooth Version: 5.0Battery: YesAudio Crossover: Full-RangeActive Noise-Cancellation: ActiveAcoustic enclosure: Passive radiator