This hair dryer is rechargeable, and hot wind and cold air working by battery, 400watt power, wind power is strong, this item design is unique, battery and air blower can be saparated, so easy to taking to travelling, outdoor and so on. Also it is multifunctional blower, the battery can be as a power bank, output power for digital items.Cordless and convenient --- This product is ideal for people to use, such as: go to holiday to use, business to use, blow sweat after exercising, blow some items on outdoor camping, blow hair and skin after swimming,blow pet skin and hair, dry baby skin stay away from eczema and so on. Constant temperature technology --- It will takes 2-3 hours to fully charge,can continuously supply cold wind 2-3 hours, continuously supply hot air 10-12 minutes, The temperature is 135°F-149°F, It can be used to blow long hair of 1-2 ladies and blow short hair of 3-4 men when it is fully charged. Battery as a power bank --- The USB switch is energy saving switch, when you need the usb output, you should open the usb switch, and you do not need it, you can close the USB output, and the battery pack can be as a power bank, and charging for mobile, MP4 and other digital items. Split design and portable size --- The battery and air blower are be seperated, and the air nozzle also can be detachabled, so easy to put into the bag and easy to carry, split design which is very suitable for traveling, saving energy, extending the battery service life, ensuring the durability of the battery, and the micro-elastic buckle is easy to install, also you can take the charger to plug into the battery DC port only to charge it. 400watt power cold wind and hot wind --- The Item Power is about 400watt, and with 2-speeds adjustment, The use of precision probe technology ensures perfect contact with snap-on conductive, ultra-high power can be up to 450W, dual speed adjustable hot and cold air speed, this hot air is constant temperature about 135°F, care you hair health and scalp.