◎ 1pc AA battery, DC 1.5 V, 1W◎ Using time: over 120 min◎ 3 Modes of CLEAN, MILDER, MASCARE◎ Smart Timer. Better Brushing Habits: the brush comes with 2 minutes automatic timerand 30 seconds interval pause that reminds users to move to the next quadrant.◎ IPX 7 Waterproof, which can be used in bath and shower.◎ Smart Memory Feature: The smart sonic toothbrush will memorize your preferredbrushing modes after each use.