For those who use laser pointer for presentation,
u may want to free your hand for controlling mouse, turn to some pages.....
this laser ring can free your hand and even can control it properly with your other hand.
I made some designs, and this it the one made from a wooden block.
+++++++++++++ Materials +++++++++++++++++
3V laser LED
CR2025 or CR2032 battery and battery holder
+++++++++++++ how to make ++++++++++++++
I use a wooden block and drill a large hole with saw ring.
I use dremel to cut some small gully for hidden the wire.
the tactile switch and the battery holder was glued.