Slim design receiver/collar ergonomically shaped to your dog's neck. 'Nick' and 'Constant' stimulation along with a non-stimulating pager/vibration. Checkered grips on the handheld transmitter for a positive feel. Rheostat/volume dial with up to 127 levels for a gradual adjustment in stimulation intensity. User expandable to a two-dog system. LCD screen displays exact level of stimulation, and a 3 bar battery life icon. Fully waterproof transmitter and receiver/collar. Low to medium power stimulation. 3/4-mile range. Rechargeable 2-hour rapid charge Lithium Polymer battery.