GoXteam QSDZ-0101 Ultrasonic Pest Repeller & Mice Repllent, 2 Packs UPGRADED DUAL CHIP: This insect repellent, with double 2018 upgraded chips emitting ultrasonic waves, irritates nervous system of insects and rats and threatens them to flee away from your house. The pest control repellent safeguards your family and solves pest troubles with no rebound effects. SAFE & HARMLESS TECHNOLOGY:The ultrasonic waves launched by our pest repellent only have influence on pests and rodents. None on families, pregnant women, children and pets. The rat repellent features no poisons, no odor, no chemicals, and no radiation. It gives you a 100% safety guarantee. SUPERIOR AFTER-SALES SERVICE: We ensure exquisite quality of our mosquito repellent. We provide a 60-day warranty from the date of purchase. Please note that normally it takes 3 to 4 weeks to get obvious results. If there is no effect after using it for 3 weeks, we will give you a full refund.