Description : • HiFi Sound Quality • Stereo Earphone • Microhopone Premium in-ear wired Earphone Soft silicone can comform instantly to your ears and preventing sound leakage. Long- Wearing without pain. Lightweight design. Earphone is with 3.5mmm jack wired connectivity technology. Earphone with high quality Speakers bring perfect HIfi Stereo sound Quality. Wider Frequency for fuller listening enjoyment. Earphonrs with built-in microphone, intelligent key control, with play/pause, answer/hang up and previous song/next song. Specification : Driver Unit : 10mm Impedance : 16ohm Sensitivity: 108+/-3dB (at 1KHZ,0.5rms) Frequency : 18-20,000HZ Lenght : 120 cm Colour : Balck and White Function of the small Black Key: On-Off Key Function :Click 1x : On/Off (for phone call)Stop/Play (for music) Click 2x : Next (for music) Click 3x : Previous (for music) Compatible with all mobile phones, Music players, Portable Gaming devides, and computers.