Welfare-friendly ultrasonic cat deterrent - humane way to repel cats fouling on your garden, lawn and flowerbedsMotion activated PIR sensors detect pests and emits a continuously variable sonic burst which is irritating to cats so they move away from garden, lawns and gravel patches. Motion can be detected up to 12 m away giving you a 120 square metre protection zone2 years warranty with full user instructions including helpful positional tipsWeatherproof, tested to IP44 standard, it can be used all year round in all weathers thanks to the unique water ingress encapsulated electronicsThe Defenders Mega Sonic Cat Repellers can be mains powered using the Defenders 9V Universal Mains Adaptor STV612 (purchased separately)Requires 2 x 9 V batteries (not included). Battery life varies depending on activation frequency but expect 3-4 months of 24 hour protectionThe Mega-Sonic Cat Repeller is easy to set up - comes with integrated soft ground mounting stake, plus wall mounting hook with screw pack provided