This manual introduces the power-saving function and sleep mode of MA0511-ChA energy-saving watch. The watch automatically enters sleep mode to save power when it is in a dark environment for a period of time. There are two types of sleep modes: screen sleep mode and function sleep mode. In sleep mode, the watch does not ring, but the timing function continues to work. The watch can be awakened by placing it in a bright place or using the automatic illumination function.