Details: When used for the first time; the movement is put into the belly of the fish; turn on the switch; grab the belly of the fish; the swing of the movement first shake a reaction. If the switch is on and it shakes and doesn't respond; you need to charge it first [The red light shows the charging status. If no light is on; the charge will be full. Generally; it will be fully charged in about 40 minutes.] [It can be used continuously for about 20 minutes on full charge]
