Please note: This product comes with a Christmas card so you can give this product as a gift to your friends or family at Christmas. 2023 Upgraded Ultrasonic Insect Repeller - Our new ultrasonic insect repeller has a built-in smart chip, adopts intelligent dual-frequency ultrasonic technology, upgrades the frequency, and improves the insect repellent effect by 200%. Alternately generate ultrasonic waves and intermittent electromagnetic wave frequency conversion to avoid mice or pests adapting to ultrasonic waves. Worry-free operation - Just plug the ultrasonic insect repeller into an electrical outlet and the repeller plug will automatically emit variable frequency ultrasonic waves. It is recommended that you mount the repeller 30-70 inches above the ground. Make sure the ultrasonic repeller is not covered by curtains or cabinets. The two ultrasonic frequencies have different lighting effects, and the dual-frequency ultrasonic switches automatically. Safe & Effective - Low frequency ultrasound is difficult for humans to hear. But very effective against mice, cockroaches, spiders, insects, worms, mosquitoes and ants. It is harmless and safe for humans and pets. No dead pests to clean up, no batteries needed. Wide Effective Coverage - Our pest repeller has an effective coverage area of 1200 square feet. Widely used in homes, warehouses, offices, restaurants, supermarkets, hospitals, granaries, attics, kitchens and other places. We recommend you install one in each room for complete pest coverage. Because ultrasonic waves cannot penetrate walls. Warm reminder: You will receive 6 pieces of insect repellent. When I first started using it, mice and mosquitoes were restless and ran around. This is what mice and mosquitoes do after being stimulated by sound waves. Please continue to use it for 3-4 weeks and they will escape from their original place. Low power consumption, low frequency, low noise, and can be used for a long time. Material: ABS, size: 92*68*31mm, voltage 110-230v, frequency 25-50kHZ, coverage area 100 square meters, suitable for: mosquitoes, flies, mice, cockroaches, bed bugs, etc.