O2 Cool 10 inch Battery or Electric Portable Fan BATTERY-OPERATED PORTABLE FAN. With O2COOLs 10-Inch Battery-Operated Portable Fan, you can cool off when youre at home, work or outdoors. Perfectly sized, it wont take up much space and features a convenient built-in handle for easy storage and transport DURABLE CONSTRUCTION. This portable fan is durably crafted using sturdy plastic construction for long-lasting strength and use. It also boasts a patented fan blade design which extends the battery life while maximizing airflow TWO-SPEED OPERATION. Featuring a powerful 10-inch blade, this fan offers high and low speeds to accommodate your needs. Both settings deliver refreshing air with minimal noise to prevent distractions. Number and Type of Alkaline Batteries: 6-D batteries EASY TO USE. Position fan face down, slide out the battery door and insert batteries following (+/-) marks, then replace door. Slide switch located on the side of fan to your preferred setting. To operate fan using AC power (120-240 VAC, 50-60 Hz), use supplied adapter only DUAL POWER SOURCES. For added convenience, the fan runs on six D-cell batteries (not included) or you can plug it in using the included AC adapter. Inserting the adapter plug into the fan disconnects the installed batteries from the circuit