The SportDOG SportTrainer 800m Remote Trainer (SD-875E) features an 800 meter range with 10 instantly selectable static stimulation levels with low/medium/high modes and tone & vibration options in select modes. This remote trainer uses DryTek waterproof technology and is submersible to 7.6 meters. It's expandable for up to 3 dogs with additional collars and uses rechargeable batteries with 2-hour quick charge.