Dogtras Edge Expandable Trainer System can be used to control up to four dogs from the same transmitter. Color-coded receivers with super-bright LED locator lights make it easy to select the dog that needs correction. Receiver and transmitter are waterproof and submersible, ideal for real-world field conditions. Rheostat mode lets you deliver precise stimulation between 0 and 127, while user-selectable intensity mode provides eight preset stimulation levels to choose from. Nick, constant and nonelectric vibration modes. Easy-to-read LCD screen displays stimulation level, mode and three-bar battery life indicator. Incredible one-mile range. Contact points are adjustable from 0.63 to 0.75 so you can use them on long- or short-haired dogs. Rechargeable lithium-polymer batteries (included) fully charge in less than two hours. Comes with a transmitter, one collar receiver, battery charger with splitter cable, belt clip, test light, owners manual and carrying case. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Training Collars.