Répulsif contre les rongeurs, contrairement aux pièges à souris ou aux produits chimiques, les appareils à ultrasons sont efficaces, respectueux de l'environnement et sans risque. Powerful Mosquito Repellent Effect：Equipped with advanced ultrasonic technology, these 4 ultrasonic electronic mosquito repellents emit specific frequencies that are highly effective in driving away mosquitoes. They create a mosquito - free zone around them, providing you with a peaceful and undisturbed environment. Safe and Chemical - Free：Unlike traditional mosquito repellents that contain harmful chemicals, these devices are completely chemical - free. They pose no threat to human health, especially for children, pregnant women, and the elderly, making them a safe choice for use in any living space. Convenient Operation：Designed for easy use, these mosquito repellents are typically plug - and - play. You can simply plug them into a power outlet, and they will start working immediately. Some models may also have adjustable settings, allowing you to customize the repellent effect according to your needs. Energy - Saving Design：With low - power consumption, these 4 ultrasonic electronic mosquito repellents are energy - efficient. They can operate continuously for a long time without consuming much electricity, helping you save on energy costs while keeping mosquitoes at bay.