1、USB power supply, plug and play, power adapter, computer, mobile power, car can all used, safe and fast ultrasonic. 2、With multiple functions, ultrasound alone, one of the most safe and various electronic insect repellent. 3、Automatic frequency conversion, produced by three constantly changing audio frequencies, does not allow mosquitoes and other pests to adapt or develop immunity at fixed frequency. 4、Very suitable for livestock, farms and other using, compact portable, colorless and tasteless, no impact on livestock fitness. 5、Made of high quality plastic material, sturdy, durable and long service life. 1 x Ultrasonic Mosquito Repeller1 x Manual Condition: 100% Brand NewItem Type: Mosquito RepellerMaterial: PlasticColor: As Picture ShownVoltage: 5-12VWeight: Approx. 35gUsing method: Plug the machine into the 5-12 vusb power socket, you can see the machine's red indicator light is on, then the machine starts to work normally, it will emit series of audio; when the green indicator flashes. From high to low audio, this is in automatic frequency scanning. At the same time, in a relatively short period of time, the mouse's ability to move is greatly reduced, but during this time the level of activities such as flies has increased a bit, because of the ultrasonic drive, after a period of time, they will be in the another three to five weeks When the interior disappears, the mice and pests will also disappear.