... most safe(the normal volume is about 60db when we talk)b.70-120db is a little ... available & need pay it,but will be refundable when you place order.4.MOQ:1,000pieces5.With CE/Rohs reports6.Please ... cooperate with many famous brand,we can provide you with high quality,low cost product,punctual delivery, ... excellent service. 3.We are factory,you can get lower price if order from us directly.Our price is ...