It offers the lightest and smallest receiver, weighing at 1.3 ounces, with ergonomically designed plastic contact points, making it ideal for dogs as small as 7 pounds. While compact, it is packed with features such as a 400-yard range, 100 Nick/Constant stimulation levels, and a Pager vibration. Collar is 3/4 x 28 inches For dogs as small at 7 lbs Rheostat/Volume Dial with Stimulation Levels 0-100 Expandable to two dogs with purchase of separate collar Receiver collar weighs 13 ounces and is fully waterproof