PLZ BE AWARE】This heated vest requires power bank(USB OUTPUT 5V-2A) which is sold separately,and generally lasting 6-10 hours if powered by 20000mAh power bank Rapid Heating】5 Heaters in total：2 on the back,1 on the neck and 2 heaters are in the 2 Pockets.You will feel warm within 8 seconds once you turn on the heated button and temperature is controllable between 95-131℉ 【Hand washable & Machine washable】 It can be washed by hand or by mathine,please put on a laundry bag before put it in the washing machine 【Best service】 We guarantee our item’s quality, please feel free to contact us if you have any questions