Haplws Portable Ultrasonic Pest Repeller Electronic Anti Flea Mosquito Device USB Charging Pest Insect Repellent

For outdoor activities: An essential item for camping, hunting, mountaineering, running, hiking, etc. High efficiency: 7-band ultrasonic infinite loop scan (13-25 KHz / 26-35 KHz / 36-45 KHz / 46-55 KHz / 56-65 KHz / 66-75 KHz / 76-95 KHz) .The Variable frequency band will return every 2 seconds and all frequencies can work together. Safer to use: Ultrasonic sound is inaudible to humans and household pets. It is 100% safe and effective. Rechargeable battery: The lithium battery is recharged by using a micro USB cable in the package. Portable design: It comes with a hook, you can hang it outdoors.