Your Fusion Lite charging cradle ships with only three prongs. The fourth prong is used at the factory to program your device and isn't necessary to charge the device. Your charging cradle should look like this:

                                                       

 

If you have fewer than three prongs (or your charging cradle doesn't look like the image above), drop us a line at customercare+lite@striiv.com, and we'll get you up and running again!