Environmental protection: ultrasonic mosquito repellent is an environmentally friendly pest control solution. It is made of ABS material, no chemicals, no special smell, no radiation, no noise, 100% safe for your family and cute cats and dogs. Ultrasonic modes: this pest repellent can emit an ultrasonic wave that continuously changes in the range of 19.5 - 135 kHz. This type of ultrasound can feel very unpleasant rats, spiders, flies, fleas, ants and other types of rodents and insects and thus drive them away from our homes and habitats. EASY TO USE AND CARRY - This portable outdoor insect repellent has a large capacity battery. It can support fast charging via USB. 33 x 14 x 46 mm, you can take it with you to protect yourself or your pet from mosquitoes or other insects. A good helper for pet friends: simply hang a portable insect repellent on dogs, cats or pets to repel fleas, lice, fleas and other insects that can help your pet avoid skin problems. Widely used: It is an indispensable equipment for all outdoor activities, especially camping, hunting, mountaineering, running, hiking, travelling, fishing, barbecuing, gardening, picnic, golf and even simple barbecuing.