The Narva Rotary Battery Master Switch is a reliable and versatile electrical component designed to provide a convenient and secure way to control the power flow in your vehicle's electrical system. The switch features a rotary design and comes equipped with a removable keyed knob for added security. The switch is equipped with a removable keyed knob, adding an extra layer of security. When the knob is removed, it prevents unauthorized use or tampering, reducing the risk of accidental disconnection or theft. The use of a key enhances the control over the switch, ensuring that only authorized individuals can operate it.