The compact SportDog SD 425X Field Trainer is ideal for training in the yard, field, or for hunting with dogs that hunt close. Both the transmitter and receiver are 100% DryTek waterproof and submersible.
The SportDOG 425 can be expanded to control up to 3 dogs by adding SportDOG Add-A-Dog Collars and has a 500 yard range. It has 21 Instantly Selectable Stimulation Levels and has Tone or Vibration Option available.
"Nick" - Quick nick with the static stimulation.
"Constant" - Constant static stimulation (Auto shut off after several seconds)