Easy to use by being plugged into power outlets, no batteries will be needed, saving you a large amount of replacement. The electronic insect repellent is a plug and play device, as long as it works, the breathing indicator light will be one chamber, one unit is best Ultrasonic mosquito repellent, electronic repellent, mouse repellent , rats, cockroaches, mosquitoes, flies, ants, spiders, insects very easy to use, just plug it in. Ideal for indoor use such as home, restaurants, hotels, hospitals, office buildings, warehouses, etc. 3-4 weeks - get the best result. 1 month later: completely eliminated depends on pest range Mosquito repellent is safe, non-toxic and non-irradiating. The ultrasonic frequency is inaudible to humans and pets, it is animal friendly, the ultrasonic repeller is guaranteed to be safe for your family and pets. For best results, one patch and one repeller are recommended because the ultrasonic wave cannot penetrate walls and solid objects. Adopt the latest ultrasonic chip for technology. The use of ultrasound constantly stimulates and interferes with the auditory system and nervous system of insects, making the insect unpleasant, destroying the living environment of the insect and forcing the insect to escape from the residence. Quiet and effective ultrasonic repeller that works with low frequency ultrasonic waves, which means it gives you extremely quiet pest control and cannot disturb you and your pet. Adopt the latest ultrasonic chip for acoustic technology and nervous system to make them unpleasant and uncomfortable, which will keep them away from home and away from it. Expensive from home. Product It is normal for insects and rodents to increase in the beginning days of use as they become will move away from their place of life after the ultrasonic attack. 100% safe and economical: silent and without radiation, without danger for pregnant women and babies to use. 3-4 weeks - get the best result. 1 month later: completely eliminated (depends on pest range). It is normal for insects and rodents to increase at the beginning of days of use as they will wander away from where they live after the ultrasonic attack. Easy to use - just plug it in. One piece, one unit is the best Ultrasonic mosquito repellent, electronic repellent, anti mouse, rats, cockroaches, mosquitoes, flies, ants, spiders , insects Product specifications: Green color. Material: ABS plastic. Product weight: 49g Package includes: Set of 2 Ultrasonic Repellents Note and Warning Do not cover the Keep out of reach of children.