A push-button located on your sink or countertop that uses air pressure to trigger the motor.
While the wall switch is standard, InSinkErator offers alternative activation mechanisms that change the "how" of turning it on. One popular model is the "Batch Feed" disposal. This type does not have a wall switch. Instead, it is activated by the sink drain stopper itself. To operate a Batch Feed model, the user places food waste into the chamber, inserts the specially designed stopper, and turns it (usually clockwise) until it locks into place. This engagement completes the electrical circuit, turning the unit on. This design acts as a safety feature, making it impossible to turn the unit on while fingers or utensils are in the drain. how to turn on insinkerator food waste disposal