Deluxe In-Ground UltraLight&trade; Receiver Collar Compatible with PetSafe in-ground fences except UltraSmart Rechargeable In-Ground Fence (PIG00-13619) and YardMax Rechargeable In-Ground Fence (PIG00-11115) Also compatible with the Indoor Pet Barrier Transmitter (PIRF-100) to protect your pet indoors Uses RFA-67 battery (2 INCLUDED) For dogs 8 pounds and up 4 adjustable levels of static correction