We need 60 Jabra C820s Headphones.  Specification:  *Active noise cancellation, effectively removes, background noise(powered by single AAA battary instored in ear cup) *connector cable for music phone with adapter *audio bypass function enables the dilivery of the compensated audio without the battery present *headphone folds flat for compact transportation *detachable cable  *includes AAA battery, plus a range of adaptors and carry case.