Features: Ultrasonic: Ultrasonic repellent, physical worming is safer. Wide angle coverage: The combined optical, ultrasonic pest repeller is very effective with 360 wide angle coverage and can penetrate walls. Easy to use: all you need to do is plug this pest repeller into a wall socket and flip the switch and the unit is ready to use. Effective: against mice, bats, squirrels, spiders, cockroaches, fleas, parasites, flies, mosquitoes, bees and other small pests. Samll and portable: This pest repeller is very lightweight and has holes for tying a string to hang around your neck, so you can take it with you wherever you go and keep your pets repelled at all times. Back clip design: The back of the pest repeller has a clip design, you can clip it to your clothes, backpack or even your hair, very convenient. Durable: one lithium battery lasts for approximately 150 hours (product does not include batteries). Three colours to choose from: Available in black, blue and pink, you can choose according to your preference.