Pro Sissy Squat Machine Adjustable HD Safe for Humans & Pets:The pest repellent does not use dangerous and harmful poisons. Just plug in and enjoy. No battery needed! 100% Child and Pet Safety: Ultrasound is invisible to humans and family pets. It contains no harmful or dangerous chemicals, is a substitute for poisons, and has no unpleasant odor. How it works: It emits high-frequency ultrasound, causing pests to lose direction and consciousness and drive them away from home. Effectively drives crickets, spiders, mosquitoes, bugs, ants, fleas Easy to use:The tiny, compact design makes it a portable plug-and-play product. Just plug in the socket and let low frequency sound waves do all the work for you. Ultrasound causes confusion, convulsions and even death, forcing the pests to move away. Wide Effective Range: Insect repellent can be used in various places, such as bedrooms, bathrooms, garages, kitchens, offices, warehouses and so on. This is very effective for 1600 square feet. For best results, it is recommended that you install each room. No mosquitoes in the bedroom will affect your sleep