An apparatus configured to lift and lower a seat assembly of a toilet includes a case that is configured to be mounted to the toilet using mounting bolts of the seat assembly. The case includes a passive infrared sensor (PIR) that outputs a detection signal in response to motion, a motor having a lever coupled to the shaft of the motor via a coupler, a direction control unit that applies a motor supply voltage to drive the shaft of the motor in one of a clockwise or counterclockwise direction in response to the detection signal, and a battery to provide power to the apparatus.