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 only electronic components.
+++++++++++++ Materials +++++++++++++++++
CR2025 or CR2032 battery and battery holder (not the insert type)
3V laser LED
+++++++++++++ how to make ++++++++++++++
Connect the negative terminal of the laser LED to the negative terminal of the battery holder with a wire. (prefer to use a thicker wire)
When u press the laser LED, the copper case of the LED will touch the metal component (positive) of the battery holder.
Use another wire to make a loop and solder to the bottom of the battery holder.
+++++++++++++ Why it is ring or not +++++++++++
I use a small PVC tubing as the ring and insert/ glued to the design, and hence it is a ring.
However, the design itself can insert to your ring and therefore it can also act as a laser module.