Note: I do know the age of these, so the battery may need a replacement.

PetSafe Wireless Pet Containment System Receiver Collar provides a reliable way to expand your existing wireless fence or replace a collar for dogs over 8 lbs. This waterproof accessory collar features five adjustable levels of static correction plus a tone-only mode for training flexibility. Designed for comfort and durability, it fits neck sizes ranging from 6 to 28 inches and includes a low battery indicator to ensure consistent operation. The package comes complete with the receiver collar, battery, test light tool, and operating guide for immediate setup.

Brand: PetSafe
Model: PIF-300 / 407095
Type: Receiver Collar
System: Wireless Pet Containment System
Correction Type: Static Correction
Levels: 5 Adjustable Levels + Tone-Only
Compatibility: Dogs over 8 lbs
Neck Size: 6 to 28 inches
Waterproof: Yes
Battery: RFA-67 (Included)
Indicator: Low Battery Light
Color: Red Strap / Black Receiver
Material: Nylon Strap
Features: Add-A-Pet Accessory
Origin: Assembled in China

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