1: Use a screwdriver to unscrew the screw in the battery pack, put in 4 AA batteries in battery pack, then fix the cover . 2: unscrew outer fan ring counterclockwise ,screw outer fan ring back into place to secure fan to costume ( usually, the fan is installed in costume, you can pass this step ). 3: plug in power cord from battery-pack to fan. 4:step into costume and clip battery pack to your own clothing. Move battery-pack switch to ON position. It wil take about some minutes for air inflating. with our strong power blower fan, you don’t need to wait too long .