A dryer includes a plurality of first electronic parts including a fan and a heater, a first battery to supply power to the first electronic parts, and a first controller to control power of the first battery. The first controller detects a charging ratio of the first battery, enters a first power saving mode if the charging ratio is a threshold charging ratio or less, and limits power supplied to at least one of the plurality of first electronic parts. A holder for holding the dryer includes a plurality of second electronic parts including a plurality of contact terminals, a second battery to supply power to the second electronic parts, and a second controller to detect a charging ratio of the second battery and enter a second power saving mode to limit power supplied to at least one of the plurality of second electronic parts.