[Description] -Includes AAA batteries. -The bristles move in an elliptical motion due to the combination of vertical and horizontal vibrations. -The bristles penetrate not only the tooth surfaces, but also into the crevices and uneven surfaces of the teeth, effectively removing plaque. -Dental plaque removal power is about 3 times higher than manual brushing. -Battery-operated, can be used for about 2.5 months (at room temperature of 23°C). (At room temperature of 23 degrees Celsius, 2 minutes per use, twice a day) -The entire unit can be washed with water. -Includes a brush to remove dental plaque.