Three hours,
The Amu m21 takes about 2 hours and 30 minutes to charge, and can be used for about 40 minutes after a full charge. Charging room temperature of about 25 degrees, the use of time after full charge is based on the use of the mode, the use of the level of strength, the use of different environment and change, according to the residual amount of the battery, the use of different environments, charging time will also change. The body of the yaman is not waterproof, so it must not be rinsed with water. Except for the electrode guide and iron ring, do not wipe other places with a wet towel.