O2Cool 10" SmartPower Fan w/USB Power Port & Adapter. Nickel Metal Hydride batteries: more environmentally friendly & higher performance than Ni-CD batteries. Fan runs on built in rechargeable batteries; AC adapter (included) Auto adapter (included) or 8 D cell batteries (not included). USB Port that will allow the user to charge their favorite personal electronic devices. Chargeable items include cell phones MP3 players GPS devices digital cameras. Two speed fan with pivoting fan cage for directional airflow. Compact design makes it great for travel and easy to carry and store. LED lights indicate power source. Grey.