The Garmin Pro 550 Advanced Dog Trainer Collar System is a top-of-the-line remote trainer that boasts a range of up to 1 mile-line of sight. It features 21 levels of continuous and momentary stimulation, non-stimulating tone and vibration functions, and 1 to 7 levels of static/shock from low to high. The collar is rechargeable and user-replaceable, with lithium-ion batteries that offer long-lasting power. This remote trainer is perfect for all dog breeds and sizes, with an expandable feature that allows up to 3 dogs to be trained with additional PT 10 collars. It also has a built-in bark limiter, internal antenna system, beacon lights, and is waterproof for added convenience. Easy to use with one-hand and "no look" operation, the Garmin Pro 550 is an excellent choice for pet owners who want to provide effective and humane training for their furry friends.