Product Parameters:output power: 32 ohms 45mWfrequency response: 200Hz-2000Hzsensitivity: 120db 3dbsignal-to-noise ratio: greater than equal 90DBdistortion: 0.5%Bluetooth standard: Bluetooth 4.1 + EDRsupport protocol: HFP. A2DP.AVRCPsupports 3.5 audio inputpower supply mode: built-in lithium battery 190mAhwhen charging, it is: 3 hours (please extend the charging time for the first time)Effective distance: 10 mWorking hours: more than 10 hoursStandby time: 250 hourscharging interface: -USBbuilt-in microphone, support digital signal processing Cancellation TechnologyStyle: HeadphoneVocalism Principle: DynamicControl Button: YesActive Noise-Cancellation: YesCommunication: True WirelessVolume Control: YesWireless Type: bluetoothIs wireless: YesSupport APP: NoFunction 1: For Internet BarFunction 2: Monitor HeadphoneFunction 3: for Video GameFunction 4: Common HeadphoneFunction 5: For Mobile PhoneFunction 6: HiFi HeadphoneFunction 7: SportPlug Type: Line TypeConnectors: 3.5mmModel Number: DW2570Codecs: AACSupport Memory Card: YesWaterproof: YesWith Microphone: YesLine Length: 1.5mModel Number: BQ618 Bluetooth HeadponeDriver Diameter: 30mmcolor:BlackMaterial:ABSPackage Contents:1 x Bluetooth HeadphoneOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.