How do I know if my Swiftpoint Pen-Grip mouse is charging correctly?

How do I know if my Swiftpoint Pen-Grip mouse is charging correctly?

While placed on a USB charger, the LED on your pen-grip mouse should respond as follows:
  1. The LED will flash rapidly for 30 seconds when it is first placed on the receiver. 
  2. After this the flashing will continue, but at a slower rate for up to 90 minutes. 
  3. Once the battery is fully charged, the LED will switch off. 
So if the LED only flashes for a short time, this should mean that your battery was already close to fully charged.