AC to DC Conversion for Ham Radio: Converts 110V AC to stable 13.8V DC; supports 30A max current (20A continuous) for ham radios, CB scanners, and 12V mobile devices Adjustable Noise Control & 10A Cigarette Socket: Eliminate pulse interference via noise-offset knob; front-facing socket powers portable devices up to 10A Short-Circuit & Overload Protection: Integrated safeguards with replaceable 8A fuse; auto-cooling fan at will only start when the internal temperature reaches 55°C Safety Protection: SKY TOPPOWER 30 amp power supply has short-circuit protection, over-current protection to ensure the safety of the operator and any connected electrical devices, plus a user replaceable fuse (8A),built-in cooling fan to prevent the device from overheating Compact Analog Display & Lightweight Build: 1.5kg metal casing with rubber feet; backlit voltage/current meters and one-key display switching Package Contents: 13.8V 30A power supply unit, US power cord, operation manual