This hidden fencing system is among the most reliable, cost-efficient pet
Containment Systems available today. A buried wire transmits a harmless radio
signal. When your dog approaches the boundary, the signal causes the dog�s
Receiver Collar to deliver a brief, harmless electrical stimulation. The dog
naturally seeks to avoid this and is content staying within established
boundaries.
Specifications
 * For outdoor use only
 * For dogs of any size
 * Fits neck sizes up to 57 cm
 * 5 adjustable levels of static stimulation
 * Tone-only mode alerts your pet with a beep
 * Covers up to 13 ares (1/3 acre/0.13 hectares) with included boundary wire
 * Expandable up to 200 ares/5 acres/2 hectares (additional wire and flags
   required)
 * Add an unlimited number of pets with additional compatible Receiver Collars
 * Run Through Prevention- Static Stimulation increases if your dog tries to run
   through the boundary zone
 * Water resistant Receiver Collar
 * Uses 1 x 6 Volt battery (included)