... )Unit weight: 300g (3) 2.5W, 3 speeds, (4) USB connection with laptop (5) Anion function Feature::1) Power supply ... : can use USB line & 3AA batteries2) Power: 2.5W, 500 mA, DC ... weight: 0.35kg.Using way: 1) Plug the USB line(included) into the fan and into an laptop ... USB,or place 3AA batteries.2) Place the fan ...