【Guaranteed Long-lasting Outdoor Protection】The effective range is about 10-60 square meters, which can effectively repel mosquitoes whether you are at home or traveling. It is an indispensable accessory for all outdoor activities, especially camping, hunting, climbing, running, hiking, fishing, barbecues, picnics and even just grilling. Keep mosquitoes away and enjoy the outdoors. 【Effective, Practical and Worry-Free】It uses advanced ultrasonic technology to interfere with the nervous system of insects, making them uncomfortable and forcing them to leave quickly. 6-band ultrasonic endless loop scanning (13-25KHZ/26-35KHZ/36-45KHZ/46-55KHZ/56-65KHZ/66-75KHZ). The variable band repeats every 2 seconds and all frequencies work together. It is safer than using chemical sprays. No need to clean up dead rodents. 【USB Charging, Convenient and Portable】This portable outdoor insect repellent features micro USB charging with a built-in 100mA rechargeable lithium polymer battery, which charges