Used for about 8 weeks when my dog was in training.excellent condition. Bought new off Chewy. Works with a range of up to 3/4 mile and with dogs 35 pounds and up, with precision-adjustable low-high stimulation from 1-127 levels. Three modes―nick for a short electric burst, constant, and shock-free paging, a vibration that can be used as a reward or warning signal. Lightweight, shockproof, waterproof collar with slim profile so it’s comfortable to wear and is weather-resistant. Ergonomic handheld transmitter with belt clip, comfort grip, and easy to see LCD screen. Perfect for detection training, obedience, hunting, competition trials, and K-9.