ISOLATE NOISE OUTSIDE OF THE MUSIC THAT YOU ARE LISTENING TO. Ergonomic in-ear isolating design block out noises, allow you to easily enjoy your personal music world anytime anywhere, even at noisy streets. The sound is clear, loud and with bass. You can hear the sound clearly and don't have to walk to quiet corners to answer phone calls any more. COMFORTABLE WEARING These exercise earbuds will not hurt your ears. They are very lightweight and so comfortable to wear that you can even wear them to sleep in. There are 3 pairs of different size backup ear tips for your custom fit. Sweat and Water Resistance Its certified IPX5 sweat- proof and water-proof increase its durability.( Tips: Although the earphone is IPX5 certified, you should try to protect it from your sweat to ensure a long durability. If you must remove and reinsert the earphones while working out, dry your ears before reinsertion to avoid getting sweat in the nozzle. Sweat will cause the earphones to slip out and may lead to a temporary reduction/loss of sound. COMPATIBLE WITH apple iPhone, iPod, iPad, MP3, Tablet, PC and Android devices. Specification: Parameters Driver Unit: 9.0MM rare-earth permanent magnetic Impedance: 16 OHM Connector: 3.5mm Gold-plated Stereo plug Frequency Response: 12HZ-25000HZ Sensitivity: 104db/1mw(S.P.Lat 1KHZ) Cable: 1.2m±0.3m PU wire Input: 3 mW Max-input: 10 mW Package Include: A.1*LinGear headphones B. 3 sets of ear tips are included; make sure you can get the best fit, comfort and sound performance. C. 1 * carrying case for you to carry your headphones expediently.