SportTrainer 1275 gives you long distance control of your dog with up to 3/4 mile range. The remote trainer can be expanded to handle 6 collars. (Sold separately) Ten levels of static stimulation in low/medium/high stimulation ranges as well as vibration and tone options in select modes. Operates on Lithium-ion batteries and recharges in 2 hours. A charge lasts up to 40-60 hours. Low battery indicator.