Four position control The rotary switch provides four selectable positions Off, L1, L2, and L3 to easily adjust fan or appliance speed for comfort and energy use. Compatibility you can rely on Suitable for a variety of devices including electric heaters and massage equipment, making it a versatile addition to many household setups. Easy and reliable installation Effortless wiring with a simple process: strip the wires and push them into their designated terminals for quick, hassle installation. Durable build you can trust Constructed from robust ABS plastic to deliver longlasting performance under regular usage conditions. Use scenarios Scenario 1: Add this switch to a portable space heater to switch between low, medium, and heat outputs or turn it off completely for safety and energy savings. Scenario 2: Integrate into a massage device or chair to vary intensity levels by selecting L1, L2, or L3, allowing users to choose a comfortable setting. Scenario 3: Use in a DIY fan project or other compatible appliance you are upgrading, providing a simple, userfriendly control interface for speed adjustment.