content: Materials Science is impressive as heck - My new $10 earbuds are so efficient they reproduce 60hz hum, through an Android Phone Had this phone 3 years, broken or lost  5 or more pairs of headphones in the interim. I go to overstock stores and buy name brands. These JBL sports headphones were $10 and they are so efficient that when I am plugged in I can hear the 60 hz hum. Never heard that before from a phone. This isn't spam, I'm not recommending these, earbuds always hurt my ear canal, these promised not to, says right on the box, but it's untrue. Sound good tho.