PetSafe PIF-300 Instant Fence Pet Containment System

For dogs 8 lbs and up. 5 adjustable levels of correction. Tone-only mode alerts your pet with a beep. Waterproof. Expandable up to 1/2 of an acre. Expandable to an unlimited number of pets. Safety Features: Low battery indicator. Correction stops after 30 seconds. Independent correction levels. Uses a constant radio signal to create a stay zone.