The ear hooks break, very easily. Don't leave it in a bag, pocket, glove compartment, or anywhere close contact with other objects. I've ended up having to buy a BT5010 and return it once to replace the ear hook. The joints on it are way too fragile and Jabra knows it. On their website there is a 5 pack of them for 5.99, which is a rip. So, finally my second ear hook broke and I called the company for advice. They immediately sent out some for me. At least they know.Oh, function. It works great for all sorts of applications ... cell phone, internet chat, and recording ... not a bad idea for the price. An inconvenience with the ear hook.