Sykik Bluetooth Stereo Headphone - Built Microphone Supports Wireless Music Streaming and Hands-Free (BLACK)
A.	Blue tooth wireless head phones B.	Blue tooth protocol standards: Blue tooth V2.1+EDR C.	Receiver range: 10m / 360* D.	Carrier frequency: 2402MHz2480MHz E.	USB Interference: High speed USB 2.0 F.	Battery: Chargeable lithiumion polymer battery (3.7V/320MA/h) G.	Charger power: Computer USB interface DC5vDC5V (500MA) H.	Travel charger, DC 5V (500MA) car charger I.	Successive working time: about 10 hours J.	Frequency response: 20Hz? 0 KHz K.	S/N ratio: 82dbL.	Speaker diameter: 40mmM.	Impedance: 32ΩN.	S.P.L: 106db S.P.L. at 1 KHzO.	Rated power: 20MWP.	Aggregate capability: 40MWQ.	Frequency Response: 20Hz20,000HzR.	Mic dimension: 4*1.5mmS.	Mic directivity: Omni directionalT.	S.P.L.:  52+2dbU.	Impedance: <2.2KΩV.	Frequency response: 30 Hz 16,000HzW.	Power supply: 3.0V