Overkill are all metal earphones that give you high quality audio at the fullest spectra. From warm low end, low mid range that gives body to the sound, all the way to clear mid range and distinct high range sounds. Even if you fill these with tons of juice they will not crack-up.
Overkill is specially made for smartphone use, and these earphones come with microphone and music controller. With the controller you can answer, hang up, pause and play the music, also play forward and rewind. Avoid using headphones with the volume turned up for an extended period of time. Doing so can damage your hearing. It is advisable to keep the volume at a moderate level at all times. For your own safety, please do not use when driving or cycling