The new MimioCapture pens have a double seal in the cover cap. When placing the cap over the marker, you may only hear one click—the single click means that the cap is not completely tight. There is a possibility that without placing the cap on tightly (which will result in two clicks) may cause the Expo marker to dry out while not in use. To make sure the cover cap is completely pressed in, use two hands and press inwards in both directions to ensure the cap is closed tightly. In addition, when the markers are not in use daily, it is recommended to remove the markers from the MimioCapture pen casing and use the original marker cap to prevent the markers from drying out.