The "Nushi 4W Electronic Insect Killer" is a device designed to attract and eliminate flying insects using electronic means. The device has a power rating of 4 watts, indicating the energy consumption while in operation. Typically, electronic insect killers use UV light to attract flying insects. The UV light emitted by the device serves as an attractant for insects. Many insect killers have a removable tray for collecting dead insects, making it easy to clean and maintain the device.