My wife and I both have the H700 for our cell phones.(motorola V3xx and Ericsson W580i). The sound quality is great - even when about 5 feet away from the cell phone.It is important to make sure that you're buying the real thing. There are tons of counterfeit H700s out there...especially on e-bay.(do a search for H700 guides on e-bay and there are many articles instructing you on how to look for the counterfeit ones. They of course have poor call quality, parts that fall off, etc.) There are many websites that sell those - and also the refurbished ones(like eCost).My coworker also has the H700 and it works well on his phone(also a motorola V3xx) for the last 1 1/2 years. However, the battery life on his earpiece is now down to about 10 minutes talk time. It was quite a jump from his 2+ hours of talk time to its current state right now. That is another reason to make sure you're not buying the refurbished ones. The lithium battery of the returned ones will probably have lost quite a great deal of storage capacity. Lithium batteries lose about 20% of their capacity per year, I believe.There are 3 versions of the H700 from motorola - H700A, H700B, and H700C... and you can find it on the back of your earpiece. They occasionally package the wrong instructions.... so go to the motorola website if you have problems. I had a C version, which has a different way of "pairing" it with your cell phone, but they included the B version instructions that of course didn't work.