amazing [SEP] i had one that took aa batteries and it worked well but the batteries had to be replaced too often so when i saw this one with usb charge i bought it it was double the price but in the long run it will be worth itbecause i do not have to change batteries it works great and the charge lasts a long time my lashes stay curled all dayupdate still good but does not stay charged for long i have to charge every other day