... for 300000 times of working.6,Power supply:a,Rechargeable storage battery (6V/4.5A).b,A/C power, as wide as ... : If you have a lot of toilet seat, use spare battery for recharging, in order to avoid stop working . )8,Charge ... :Suggest to charge every 3 months, so that the battery is able to work longer.9,Safety and energy save ...