The SportDOG Brand SportTrainer 875 is designed for field training and hunting with close-working dogs. Featuring an easy-to-read OLED screen, you can view the selected dog, static stimulation level, and mode, as well as battery status, with just a glance. This, combined with large plus/minus buttons to easily toggle among dogs and stim levels, makes the SD-875 especially suited for multi-dog hunting situations. with SportDOG Add-A-Dog Collar Receivers, the remote trainer can be expanded to control up to 3 dogs at once. 10 levels of both continuous and momentary static stimulation, as well as vibration and tone options in select modes, allow you to customize this system to fit any situation or dog's temperament. Dog training collar has a 1/2 mile range for convenience 10 levels of static stimulation with low/medium stimulation ranges; option to train with vibration and tone in select modes OLED display shows selected dog, stimulation level, stimulation mode and battery status Expandable to 3 dogs with purchase of additional Add-A-Dog collars Waterproof and submersible to 25 feet using our patented DryTek technology Rechargeable lithium-ion batteries charge in 2 hours; last 50 to 70 hours per charge Dog training collar is ideal for dogs 8 pounds or larger with neck sizes 5 in. to 22 in. Includes a remote transmitter with a removable antenna, receiver on 3/4 in. collar strap, adaptor, standard contact points, long contact points, test light tool, lanyard and quick start guide