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Sport Combo Electronic Dog Training Equipment Tri-Tronics a Garmin company G3series Ruggedness, Reliability Proven The leader in Electronic Dog Training for Over 40 Years Multi-fauceted remote trainer with built-in versatility allowing you to pick from 3 different modes to suit your particular training style and needs. Field expandable to control up to 3 dogs (additional collars purchased separately). Mode selection dial allows you to pre-set 1-3 simulation schemes for your training style/situation with up to 20 levels of momentary or continuous and an option for tone Consistent 1/2 mile range Waterproof Stainless Steel contact points minimize neck irritation on the dog Please be able to meet in Forest Hills, Queens, (occasionally in Manhattan), and take a look at my other postings too!