The Mainstays Rechargeable USB Portable Fan in white allows you to take your fan with you everywhere you go. The highest setting runs for up to 4 hours on average and offers a 3.54-inch blade diameter with a manual control that has 3-speeds (High-Medium-Low) which you can adjust as you like.The fan is powered by either a dual powered battery (3200mAh) or USB (48-inch cord included). This fan gives you personal attention with adjustable air-out angle, so you can aim the cool air right where you need it. The compact design is ideal for personal space cooling at home, in the office, or at school. With the unique design, you can place your fan on a table or move the personal fan from room to room. The fan is just the right size to take with you in a bag, as well!