Your Scent Controlled Wallflowers plug has three different settings (low, medium or high). Just press the button on the side of your plug to choose your desired setting.
Medium is the default setting and is the same level as standard Wallflowers. If you choose to set your Wallflower to the low setting, the fragrance could last more than 1 month. The Medium setting will have approximately 1 month of fragrance while the High setting will likely last less than 1 month.