Since 1968, Tri-Tronics has been devoted to providing the safest, most reliable dog training tools on the market. Tri-Tronics Remote Trainers have gone through several generations to stay on the leading edge. Tri-Tronics now manufactures products that allow dog handlers to use either continuous or nick stimulation with a wide spectrum of intensity and a range of one mile (two miles in the Trashbreaker Ultra EXP G2)