The 1-mile, single-dog version of the bestselling 1900S e-collar, the Dogtra 1900S Black Edition Boost and Lock Electronic Collar Training System for Dogs delivers versatile, durable performance for extreme conditions at extreme ranges. Extreme IPX9K waterproofing gives you the confidence you want for training or competing in the field. Volume dial adjusts the stimulation levels from 0 to 127 and features low to high power. Nick, Constant, and High-Performance Pager Vibration modes as well as Non-Stimulating High-Performance Pager mode lets you choose the stimulation that'll work for your dog. Also features an easy-to-read LCD lifestyle, enhanced contact points, and built-in blue LED lights. Powered by 2-hour rapid-charge batteries (included). For dogs as small as 35 lbs. This dog-training-collar system includes a transmitter, receiver, battery charger and splitter cable, test light, belt clip, lanyard, carry case, and owner's manual. Mfrs. 1-year warranty. 1-mile, single-dog model Extreme IPX9K waterproofing Volume dial adjusts stimulation levels from 0 to 127 and features low to high power Nick, Constant, and High-Performance Pager Vibration modes Non-Stimulating High-Performance Pager mode Easy-to-read LCD display Enhanced contact points Built-in blue LEDs For dogs as small as 35 lbs.