That is, the market enters the stop-loss profit range and plays a warning role. Generally, MT4 platforms have this kind of service, with green representing imminent profit and red representing imminent stop loss. Generally, this discoloration will be triggered in the range of 100. Both foreign exchange gold futures products will have such a display. This warning is usually accompanied by the MT4 software system. If you need a separate warning, you can write an early warning function, which is suitable for pop-up window or sound warning.