CO Detection Technology – Shuts down the generator when harmful levels of carbon monoxide are detected. Built In Handle – Allows you to carry the generator with one hand for easy mobility. Easy Start – Start Stop Choke dial makes starting the generator quick and easy. Steady Power – Inverter technology produces safe, clean power, ideal for sensitive electronics and tools. Ultra Quiet Design – With fully enclosed case. Automatic RPM Control – Adjusts engine speed, reducing consumption and sound levels. USB Ports – Charge smart phones, tablets and other electronics. Parallel Ready – Connect two Craftsman 3300i inverters to double your power output with available parallel kit (sold separately).