Most headsets will stay on so long as they are connected to a bluetooth device (your PPC). Generally if they loose connection they will auto shut off after X minutes. I have a Plantronics 510 and as long as the bluetooth on the PPC (or base unit) stays on it will stay connected. However keeping the 6700's bluetooth on is nearly impossible. Sometimes the bluetooth on my 6700 will work for 2 hours. Other times only 5 minutes. It will NEVER last all day. I also have a JVC KD-BT1 in my truck. I have gotten in the habit of checking my phone everytime I am walking to my truck just to make sure the bluetooth is on. It drives me nuts when my phone rings in the truck and I cannot answer it through the hands free.