Keep your skin bite-free with the Ultrasound Anti-Pest Repelling Device Just add some water and then 3-5 drops of bug repellent or essential oil in too This handy repeller produces ultrasound and bionic sound waves Effectively keeps insects and pests such as biting mosquitos away Frequency: 25Khz-75Khz Water tank capacity: 45ml Power: 5W Voltage: 3.7V Choose from 3 colours: black, white or brown Save yourself from bites while you save 75% on the Ultrasound Anti-Pest Repelling Device