We purchased this headset in 2002 for my hard of hearing husband.  We purchased it with an extra battery.  It has just now 10 1/2 yrs later needing the batteries replaced as they won't hold a charge.  it is still a great headset and he hears the tv at least 50% better than with his hearing aids. 
the wireless range is good as long as you are right in front of the system.  if you get behind it or go to another room it doesn't work.  I would recommend this to anyone!