- The GBARAN QWC ultrasonic repellent uses advanced variable frequency technology (20-55KHz) to effectively repel mosquitoes, cockroaches, mice, mites, and other insects - Pack of 4 units, each covering up to 120 m², ideal for homes, offices, hotels, and warehouses - Safe for humans and pets, as the ultrasonic frequency is neither perceptible nor harmful - Easy to use: just plug it into the power outlet, no chemicals or maintenance required - No batteries needed, low energy consumption (3W), silent operation and odorless - Recommended installation at 10-30 cm from the floor and without nearby obstacles for maximum effectiveness - Helps keep spaces pest-free continuously and without residues - Compact dimensions and discreet design, perfect for any indoor environment