I've had these for about 10 years, they are old design.  They used to be top of the line and very expensive.  Now they are no better than some $30 models.  The pros: slim design, individual volume knobs for each side.  Negatives- they are always turning themselves on.  I have to replace the batteries almost every trip to the range if you forget to double check they are off when you last put them away.  Trying to pry off the ear pieces to get to the batteries means your screwdriver will slip and cut open the vinyl covers.