I work 10 hr days in a high paced call center and never have to recharge while working. It can be positioned right at the waist in front, or tip the ends down just a bit and this will include the lower abdomen! After coming home, rinsed them off thoroughly to get sea water off and let them dry off and they are good to go again. Happy I bought it would buy it again. The 2 middle boards are almost the same but you have 50/50 chance on guessing the right combination which actually results in 25% chance of getting it right the first time. The pros are price and the bar itself feels sturdy. My new AT4040s, on the other hand (pun intended), are down-right ravenous with bass frequencies in a close-mic situation, like mine. This item takes a lot of force to make sure everything is connected all the way. Our polycom phones required a rj9 to 3. I used the fit chart and also drew around my foot on a piece of paper.