Product Description Characteristics: 1. The 28 outlet of the fifth gear wind is like an aviation turbine to gather air to compress and cool down, and then release it. The wind power is ten times that of ordinary neck hanging fan. 2. Low pressure turbine cold air system. The low pressure turbine system is similar to the refrigeration principle of air conditioning. 3.180 rotation around the cold wind at any time to control the wind direction, surround the whole body air supply, direct to every corner, let you every pore send out cool; 4. It can be folded for storage, and it is very portable to put pockets and bags. Wherever you go, there is wind. 5. Ultra-long endurance new energy battery built-in lithium battery 4000mah, gear selection (1-5) can work for about 3-7 hours. 6.LED digital display at any time to grasp the use time, stall display and remaining power display; Parameters: Product Name: Bladeless turbine hanging neck wind type folding digital display Color: White/blue/green Expansion size: 5.5x20.5x24.6CM Folding size: about 27x9CM Function gears: folding, digital display, fifth gear Shake the head: Shake the head up and down Package size: 12x9.2x29.5CM Product material: ABS Charging time: about 2-3 hours Available time: About 3-7 hours Battery configuration: Lithium battery 4000mah Net weight: about 300G Operating voltage: 3.7V Working power: about 1-3W Packing list: 1xHanging neck fan 1xUSB charging cable 1x instruction