Usage Tips The gear of the Weedburner: It will not heat up when it is pushed to the first gear. The first gear is the cold air mode. It is the high temperature burning mode to push to the second gear. It can make the weeds in about 10 seconds drop. When burning grass: The machine should be aimed at the root of the grass for about 10 seconds, and the grass will die the next day. Turn off the Weed burner: Do not turn it off all at once, it is best to push it from the second gear to the first gear for dozens of seconds, let the product cool down, which can improve the service life of the Weed burner.