The 150 ml USB App Driven Smart Ultrasonic Aroma Diffuser fills your space with the scents you love. This Diffuser runs is connected to the Trapp Smart app for easy customization including colors, diffuser strength, and timers and schedules. To use, download the Trapp App from the Apple or Google app store, add water and the essential oil of your choice, turn it on and, let the cool mist refresh your mind and body. Our diffusers are the perfect stocking stuffer for the woman in your life.