In-Ground Radio Fence UltraLight Receiver by PetSafe

PetSafe says:

This extra receiver collar can be used to add another dog or as a replacement collar to the In-Ground Radio Fence (PRF-3004W) or the In-Ground deluxe Radio Fence (PRF-304W). The UltraLight™ Receiver comes complete with collar, batteries and short probes for short-hair dogs and long probes for long-hair dogs.

* Waterproof UltraLight™ Receiver with adjustable collar

* Weighs only 2.5 ounces

* Uses RFA-67 battery (included)