The ultrasonic pest repeller emits low frequency sound, designed to repel indoor household pests and work without noise or smell, human and pet friendly Plug the pest control devices into outlets and they will start working when the blue night light comes on, easy to use Install one pest repeller throughout each room for full coverage, deterring mice, bugs, cockroaches, ants, and more Wide applications, you can insert these pest control repellers anywhere indoor there is pest activity Based on ultrasonic pest controlling tech, the results may can take 3-4 weeks, depending on the severity of the pest infestation Plug Type:US Plug,it applies to Canada, India,Mexico, Thailand, the United States, the Philippines,Taiwan and so on. type: blue light colour: white Material: ABS Size: 90x56x35mm Package Contents: 6 x Pest Repeller Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.