Features: Noise Cancellation， Noise Isolation， Water-ResistantItem specifics:Earpiece Design: Ear-Cup (Over the Ear)Fit Design: HeadbandConnectivity: Bluetooth WirelessModel: V8Specifications:Speaker diameter: 40mmImpedance: 32 ohmsSensitivity: 102dBWorking current: 50mAWorking voltage: 3.7VFrequency response: 40Hz-20，000HzSNR:85db1.2.4G Hz HD Pure Stream transmission2.Double receiving antenna design3.Instant plug-in and use codeless4.Built-in high-efficiency chargeable lithium battery5.Adjustable microphone