High Tech Pet YB-1 Yard Barrier Outdoor Sonic Electronic Pet Fence

Uses sound, not shock, to keep pets out of flower beds and gardens, off porches, away from pools, ponds, trash cans or any other off-limits area. Heavy duty waterproof outdoor receiver unit may be placed anywhere that's off-limits to pets. Lightweight waterproof electronic collar sends an ultrasonic signal that triggers a loud audible sonic blast at the receiver when the pet approaches. Allows people to come and go without triggering the alarm. Requires one 9-volt alkaline battery (not included)