Powered for yards up to 25 acres.

Waterproof Ultralight receiver weighs only 1/5 ounces.
Safety features include protection against false signals and timeout feature on receiver.
Easy-to-follow operation manual and video.
This system will support an unlimited number of collars (1 is included).
Collar is completely watrproof.
Adjustable nylon strap fits 12" to 18" necks.
Uses two convenient 3-volt batteries (provided).
Exclusive Lifetime Warranty.