Made for high-drive hunting dogs that sometimes offer more resistance, the SportDOG Brand FieldTrainer 425XS Electronic Dog Training Collar helps keep your dog focused. Built around SportDOG's smallest and lightest FieldTrainer e-collar, the 425XS puts 21 levels of static stimulation, tone, and vibration corrections in hunter's hands. Designed for in-the-field training or hunting with close working dogs, the 425XS offers a higher static stimulation range than the 425X system to handle higher-energy, easily distracted dogs. System works with up to 3 dogs (with purchase of additional Add-A-Dog collars - not included) up to 500 yards away. Easy to use controls gives a trainer correction control with a simple twist of a dial and push of a button, allowing the operator to focus on the dog(s). Waterproof collar design is submersible to 25' thanks to DryTek technology. Collar features rechargeable lithium-ion battery for 50-70 hours of use per charge.Manufacturer model #: SD-425XS. Dog training collar for more stubborn hunting dogs Smallest and lightest e-collar in SportDOG's FieldTrainer line Correct with tone, vibration, or one of 21 static stimulation levels Higher stimulation range than the 425X - handles higher-energy, easily distracted dogs Expands to 3 dogs with Add-On collars (not included) Easy-to-use collar design DryTek waterproof design - submersible to 25' Rechargeable lithium-ion battery in collar