The controller's built-in adjustable spring-loaded clamp allows secure docking of any Android handset (including the Samsung Galaxy S3) or iPhone while sturdy soft rubber clasps protect handsets from being scratched or damaged.
"Being hand-written would have made it rare and valuable even when it was new, so it is not a surprise to find it shows signs of marks from the copper clasps which held its chains when it was in the nun's library, " he said.