Diffuser vessels for insect repellents; Electric aromatherapy diffusers; Electric aromatherapy oil diffusers; Electric essential oil diffusers; Electric fragrance diffusers incorporating night lights; Non-electric aromatherapy diffusers for use in showers; Plug-in diffusers for air fragrances; Plug-in diffusers for insect repellents; Plug-in diffusers for mosquito repellents; Ultrasonic aromatherapy diffusers