WILL FIT SERIOUS/ PROFOUND LOSS UP TO 100 DECIBELS OF LOSS.3 PROGRAMS /LISTEMING MODES , ADJUSTS WITH BUTTON , VOLUME ADJUSTS WITH ROCKER BUTTON.COMES WITH TUBE , YOU TRIM TO FIT , DOMES , CASE , INSTRUCTIONS , DOMES , CASE .PROGRAMS HAVE NOISE AND WIND BLOCKS THAT CAN BE ADDED.CAN BE REPROGRAMMED FREE FOR LIFE OF AID