D.T. Systems Dog Training Collars D.T. Systems has been building the world's finest, most advanced and affordable electronic training collars since 1983. D.T. Systems has consistently led the industry in cutting edge technology -- they were the first to introduce state-of-the-art microcomputer technology in their training collars. Each digital collar is lightweight, compact, convenient, and easy to use. They were also the first company to offer Positive Vibration? features in an electronic collar. D.T. Systems' collars were the first to feature an internal antenna woven into the nylon webbing of the collar, a patented process exclusive to D.T. Systems collars. Their premium lifetime warranty is the best warranty offered in the industry, and it's free to participating customers. It changes D.T. Systems' normal one-year parts and labor warranty to a lifetime warranty against manufacturing defects on parts and a one-year warranty on labor. D.T. Systems' top-of-the-line SPT2400 Series offers ''Jump'' and ''Rise'' features, allowing instant jump or a gradual rise in intensity the longer you hold the button. LCD display with 50 adjustable intensity levels from the lightweight, waterproof transmitter. Nick momentary or continuous stimulation; Locate, Run/Point Peeper Modes, Positive Vibration? on left side of transmitter, Intensity Up/Down on right side. Built-in safety shutoff; rechargeable NiMH batteries in transmitter and waterproof collar. Beeper/Locator on models 2430 and 2432. Up to 1.3 mile range. Case included. Stimulation Types V =Vibration C =Continuous M =Momentary