I received this free with my Razr V3 phone. I had this since December.Pros: People say I sound good, no echo. I've been using rechargeable batteries which usually last 2 weeks. (1.2 volts)I could walk 20 plus feet (6.1 meter)without droping my call.Cons: Volume is a tad low.Won't power off. Stays in standby mode.