Usb Negative Ion Purifier Home Bathroom Portable Mini Mosquitoss Killers Features: using electromagnetic and technology, this drive will defend your property from any pest.worm will be disturbed and disoriented, leaving your worm behind. human and household animals can not hear sounds, can replace dangerous poisons, sprayers, chemicals and traps, no smell and dead bodies. [wide coverage, silent operation] - this operation, so you can set it quietly in children's room, bedroom or guest room. Insect repellers can effectively cover and control up to 800-1200 feet of each device. It is recommended to install one equipment in each room. Please note that Ultrasonics waves cannot pass through solid materials and walls, so do not put furniture or any other items in front of them and keep doors and windows close to allow the waves to expand and work. It can be used in various occasions: as long as there is a USB interface, it can be used directly. [no noise] - the Ultrasonics wave emitted by this driving device is far the range of human hearing. Enjoy a quiet and pest free sleep without worrying about noise, so that your family can have a good sleep form. Product Product weight: 27.1g Product size: 113x40x26mm Packaging size: 118x42x36mm Power supply method: USB Material: ABS Input voltage: 5V1A You can get:1xinsect repellent