Lightweight and comfortable: The 3 sizes of ear tips (S,M,L) that are included allow you to choose a size that gives you the most comfortable listening experience even for longer listening periods High Clean Bass. Troubleshooting steps : Kindly ensure 3.5mm port on Host device is clean and dust free and 3.5mm jack of the earphone is adequately inserted inside the input device port Noise Isolation Microphone, Dynamic frequency response range (Hz) 20 Hz – 20 kHz. One-Button Universal Remote with Mic Ultra Lightweight and Comfortable with 3 sizes of ear tips JBL Signature Sound JBL C50HI In Ear Headphones - Blue With its compact design, crisp and clear audio output, and comfortable fit, the JBL C50HI In-Ear Headphones is a great choice for on-the-go listening sessions or conveniently making and taking calls from your connected mobile device. Powerful bass for immersive sound Includes 3 sets of ear tips to fit different ear sizes Lightweight construction makes it suitable for extended listening periods Convenient 1-button universal remote with mic for managing calls