[Sound Alarm Version] VERIGOO 300W 12V DC to 110V AC Car Power Inverter with 2 110V AC Outlets and 4.0A Dual USB Charging Ports for Laptop, Tablet, Cell Phone, etc [ Safety Features & Sound Alarm ] -- Built-in 6 fault protections: reverse polarity, low-voltage, overload, over-voltage, overheat and short-circuit protection. The inverter will automatically shut down when it exceeds the safe design parameter. At the same time the buzzer makes "beep" sounds, you can easily know where the problem is and resolve it timely. All these can protect inverter and your devices. It's especially useful in protecting yourself from draining your battery [ 2 Power Supply Options ] -- While driving, you can plug it into cigarette lighter, it can provide up to 150 watts of continuous power; When you're at a campground, you can hook it up directly to car battery, it can deliver up to 300 watts of continuous power. Cigarette lighter adapter and alligator clips cable are included for both options [ Power or Charge 4 Devices At Once ] -- You can access two 110V standard three-pronged AC outlets and 2 USB charging port (4.0A max) with smart identification technology. You can plug in two three-pronged plugs as well as charge two devices at once. More than one person can use it at the same time. Great for family travel [ Intelligent Fan thus Quieter Operation ] -- Unlike other fixed-speed fan, the fan is controlled by temperature sensor and circuit. The fan comes on only when the inverter internal temperature exceeds the set value. Keep the inverter within a specified temperature range to prevent overheating, instability and malfunction. Thus make the inverter ultra silent when operating [ Compact and Lightweight ] -- Just 7.2 x 3.7 x 2.2 inches and only 18 oz for space-saving and easy storage, you car tuck it under the seat of your car, put it in a hidden compartment. keep it in your car when traveling it will be excellent for emergencies: power laptop, game console, portable lights; charge tablet, cell phone, camera, etc