Vktech Mini Super Hand-held Mute USB/Battery Cooling Fan for Outdoor Sports Black (Black) Vktech is your best Choice 100% Brand new and high quality USB connection power also battery operated Size: Approx. 16 x 9.5 x 4cm (L*W*H) Input voltage: 5-6V Color: Black the Mini Hand-held fan which has one 5 star positive feedback is from Vktech,we could ensure that the Mini Hand-held fan from Vktech is good