The "hands free" HF820 was highly recommended by the Motorola sales person after I purchased my new KRZR phone from US Cellular.  Being a very careful shopper, I did some research online and some of the past reviews must have been written about the previous model.  Comments like, "doesn't hold a charge" or "it doesn't let you know when to recharge the batteries" are totally false!  After I charged the unit the first time and waiting for the charge light to go out, I linked my bluetooth phone to the HF820 in about a 2 minutes (it's simple to do) and I was amazed at the clarity of sound.  By turning on your phone's "auto answer" your cell phone will ring along with a very distinct and pleasant ring from the HF unit itself and you can just start talking!  It's really cool!  If you want to make a call, just press the large and easy to find blue button and the unit will ask you for a command --- I simply say, "Call mom--home" and it confirms your request, I say, "yes" and it responds by saying, "calling."  If you list more than one number per person, it will ask you which number?  You say ...home or ...mobile.  The duplex sound is incredible and the volume is fully adjustable on the unit as well from your phone.  The only draw back I have is the unit doesn't always ask you to say a command when you press the large blue button.  I've learned to reset the unit's "on" button and then it works great.  When the unit's power gets low, the side light blinks...after the charge it will last for hours.  One hint to make the batteries last longer:  leave the unit off until your phone rings in your pocket.  Then turn the HF820 "on" and within 3 seconds you're talking hands free.  I live near Chicago where it is now illegal to hold a cell phone and drive.  This is  must have for safety.  The unit lists for about 99 bucks, I purchased it on sale for $69 with free shipping -- great value!