Good Knight Gold Flash Is India's Most Powerful Liquid Vaporiser. It consists of a mosquito repellent refill and a clip-on electronic mosquito repellent machine. This vaporiser system is powered by gold flash technology that has 2 modes - flash and normal mode. Flash mode can be used when there are many mosquitoes and normal mode is used when there are fewer mosquitoes. Visible powerful flash vapours instantly spread across the room and drive away mosquitoes, even the hidden ones. Flash mode releases visible vapours for 30 minutes every 4 hour, providing you and your family superior protection against mosquitoes. It is absolutely safe to use the mosquito repellent machine around children and family.