The Remax RM 510 In-Ear Earphone Black Speaker size 10MMImpedance 16+_15%Frequency response 20-20000HzSensitivity 87 +_3dBMicrophone sensitivity 42 +_ 3dBBear the maximum thrust 20mwPlug:3.5mm LLine length 1.2MWith fashionable style and fabulous tone quality.Trendy and stylish earphone, noise isolation with precise bass, high fidelity sound, and universal 3.5mm jack. This stereo headset is suitable for all mobile devices such as iPods, MP3 players, MP4 players, iPhones, iPad, iPad Mini, and mobile handsets. Delivers clear, crisp sound through ergonomically designed earbuds. It has a standard 3.5mm stereo plug and a 1.2m long tangle free flexible cord that is comfortable to wear and has rich bass. the base of the earphone is made of electroplated metal to give it a solid sound. By using this earphone you can answer the call, control the music, and photo control (these functions have litter differences) between different brands of smart phone.