Opticon PHL 5300 Quickstart Guide - Manual (Page 7)

5
Use for the First Time
Install Supporting Backboard
When this product was shipped, the charger’s supporting backboard and
cradle were packaged separately. After open the package, please install the
backboard into the slot on the cradle as shown in the figure above. Remind
you that, once the backboard is installed, you cannot take it off. Otherwise, the
blackboard’s safety hook will be broken and cannot be used again.