The Tag-A-Long easily slips onto your Garmin DC-40 Collar, Garmin DC-50 Collar, Garmin TT-10 Collar or any of your shock collars to fit as one unit.  This replaces having to put two or more collars on each dog.  The Tag-A-Long is a full-powered transmitter with your choice of an 8,000-hour or 16,000-hour battery.  Light enough for a beagle - yet powerful enough for a bear hound.  The collar will work for ALL types of hunting dogs.  (Tree switch an additional $10, subject to crystals in stock)

Is cheap insurance when you GPS looses signal

Works with Garmin T5 & TT15