O2COOL 2" Rechargeable Portable 3 Speed Personal Necklace Fan, Gray O2COOL 2" inch Rechargeable Necklace Fan provides ultimate hands-free cooling with vertical airflow and a wearable, travel-ready lightweight design. No batteries required for use – just charge and go! Choice of 3 speeds to customize your cooling! When fully charged with included USB charging cable, this fan runs on Low up to 11. 5 hours, Medium up to 8 hours and High up to 5. 5 hours. Easy to charge with included USB cable. The perfect year-round accessory for pool, outdoors, travel and sports. Powerful, vertical airflow is directed at face and neck for optimal cooling. Keep kids and adults cool during activities and summertime fun in the sun! Perfect for the beach, hiking, camping, concerts, festivals, sporting events, amusement parks, and vacations.