The Quad Lock® Waterproof 12V to USB Smart Adaptor comes with everything needed to power your Quad Lock® Weatherproof Wireless Charging Head from your motorcycle, boat or caravan. Multiple Switching States: Easily toggle the Smart Adaptor between On, Off, and Auto. Use On when connecting the Smart Adaptor to constant 12V - 24V supply, such as your boat or caravan. Use Auto function to keep the device off until input voltage rises above 13.5V and turn off when input voltage drops below 12.5V. Perfect for your motorcycle, ATV, etc., to avoid battery drain. Reverse Polarity Protection and In-Line Safety Fuse: Reverse Polarity Protection saves your battery in the instance the Ring Terminal Cables are connected to the incorrect battery terminals. And the in-line 3A rated fast blow fuse protects from battery drain in rare case if there were a fault.