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Good Knight refill cartridges are mosquito repellent liquids that can be used with various Good Knight machines: Good Knight Gold Flash RefillThis refill is designed to be used with the Good Knight Gold Flash electric plug-in machine. It has two modes: Flash mode: Releases visible vapors for 30 minutes Normal mode: Automatically switches on every four hours Intelligent heater system: Automatically switches to Flash mode every four hours for 30 minutes