Effective Insect Repellent: Designed with ultrasonic chip, it is impossible for humans to hear ultrasonic waves, but they disorient and agitate pests, even driving them away from you. Which can not only repel mosquitoes, but also repel various insects: cockroaches, ants, moths, mice, etc. Safety & Environment Protection: Outdoor mosquito repellent is safer than traditional mosquito killers. No chemicals, no smell, no poison and no radiation, no noise, it is 100% safe for your family members and adorable dogs or cats. Long working hours: USB charging, large battery capacity. Outdoor mosquito repellent can keep working for 7 days, easy to wear, protect yourself from mosquitoes or other insects. Ideal for your camping or travel companion. You can use a rope to hang it around your neck or hang it on your bag. Easy to use: Used to drive away mosquitoes, insects, ticks, fleas etc by emitting ultrasonic waves. Ultrasonic Insect Repellent Killer is portable. Widely used in homes, warehouses,