On the strength of the reviews I purchased a pair of MM30i for my IPhone 4. The sound is frankly rubbish very tinny no base and not a patch on the standard earphones that apple supply with the phone. Very disappointed, save your money and buy a pair from Apple. I want a refund.
I purchased a Pingmee tracking device and found it useless. It either never finds its location or takes up to an hour to report back. I sent the product back two months ago and I have heard nothing from the company. Strongly recommend you do not buy this product. I subsequently purchased a Garmin personal tracker, more expensive but it works.