Since they are a dependable PPC, the only maintenance required of these headphones is to solder the wire at the plug once every three months and then cover it with heat shrink tubing. I have been purchasing this model of headphones for more than three years. I bought the last ones about 3 weeks ago and 10 days ago in a scuffle when they flew off me, someone stomped on them in a puddle, one earphone was well slapped with asphalt, the other one opened up and the speaker came off, but when I got home I dried them with a hairdryer, soldered the torn off speaker, glued the earpiece with glue because it no longer latched and they play like a new frequency response is not broken, the balance is also
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