Have to brag about this headset: It's not a fancy make and it doesn't look high-tech, but it's DIRT CHEAP! Small! Light weight! Very adjustable, easy to put on and take off, and yes, you can use on right and left ear(you just need to swing the boom around) I wear it with sunglasses and regular glasses, no problem. Great sound! Callers hear me great, I hear callers great! On/Off button on the wire! Use on cell phone (Nokia) and cordless phone! I love it and recommend it.(Glad I bought 2!)