Edifier P270 delivers solid sound quality from its aluminum housing. Ultra lightweight in-canal earphone is what you need for all day comfort. With the in-line controller you can take a call all without taking your phone from your pocket. The P270 has one button that works on iPhones and most Android phones such as Samsung, HTC and Nokia Windows Phones. There's no volume button due to the fact Apple and Android has different specifications for volume buttons. Available in Gold, White, and Black. Technical Details: FREQUENCY RESPONSE: 20Hz～20kHzIMPEDANCE: 32ΩCONNECTOR TYPE: StraightSOUND PRESSURE LEVEL: 100dBCABLE LENGTH: 1.3mWEIGHT: 0.012kgCABLE TYPE: Y-Shape, Equal LengthCONNECTOR: 3. 5mmINLINE CONTROL: Yes, one buttonDRIVER UNIT DIAMETER: 10mm Buy with confidence from world's second largest manufacturer. Edifier is the world's second largest consumer audio manufacturer. Despite not well-known in the US, Edifier has great market shares in Asia, Europe and South America. Edifier is the parental company of STAX, one of the most expensive headphone brands in the world. Edifier has incorporated similar technology and design concept into its consumer earphones and headphones, and strives to make the best sound affordable to everyone.