PetsSafe PIF00-12918 Stay + Play Extra Wirelss Receiver for PetSafe PIF00-12917 Stay + Play Wirelss Fence.

Features:

• 5 adjustable levels of correction, plus tone-only mode
• Low battery indicator
• Waterproof
• Fits neck sizes 6 to 23 inches

Levels of Correction:
Level - Receiver Collar Function - Temperament of Pet

• 1 - No Static Correction, Tone Only - Initial Training Mode
• 2 - Low Static Correction - Timid
• 3 - Medium to Low Static Correction - Timid or Average
• 4 - Medium Static Correction - Average Energy
• 5 - Medium-High Static Correction - Average or High Energy
• 6 - High Static Correction - High Energy