Save up the money you would spend on bi-monthly replacements and buy yourself a Bluetooth. I was delighted when I first got it because it seemed to be able to pick up my voice even though the little microphone arm doesn't even reach halfway down my cheek, but apparently I was loud in my excitement, because every conversation that followed using this device went something like "What?" "What?" "I didn't hear you, what did you say?" "Huh?" It looks kinda cool, but it's actually sized for a rather large ear and gives me two headaches: one from having to force it into my ear canal and the other from the gentle buzzing hum that you hear whenever it's in. The little rubber thing that fits into your ear is huge and is yellow when it comes. There's a button on there that sometimes hangs up the call when I press it, but it's as unreliable as the plastic the thing is made of. Seriously, save your money.