A washing machine has a washing tub containing a rotary perforated drum, and a washingrinsing-liquid dispenser, fluidly connectable to a water source. A command is identified based at least on the parallel gestures and an action associated with the command is performed. The processing system can processes the received ultrasound data signals to generate an ultrasound image and the received blood pressure data signals to generate a blood pressure trace. The engaging device includes a pull tab mounted on the base, a pair of latch springs cooperating with the pull tab and a pair of fasteners mounted on the main housing.