# Trading System: watchPeriods()
Watches the periods of the specified symbol and timeframe/s.
- Interface
class MidaTradingSystem {
protected watchPeriods (symbol: string, timeframes: number[] | number): Promise<void>;
}
Watches the periods of the specified symbol and timeframe/s.
class MidaTradingSystem {
protected watchPeriods (symbol: string, timeframes: number[] | number): Promise<void>;
}