"If you're headed out for a day in the sun, be sure to bring the O2COOL Deluxe Necklace Fan with you. This lightweight and low-profile wearable fan hangs around your neck by an adjustable cord. Its small, but powerful fan blows upward from your chest to help cool you down on hot days. This necklace fan requires 2 AA batteries and operates for up to 12 hours. 4.75""H x 3.4""W.Manufacturer model #: FN02001. Vertical airflow blows upward from necklace position Operates for up to 12 hours Adjustable necklace Requires 2 AA batteries (not included)"