Step 1: Time to Build It
You will need
A mintyboost kit (you can make on yourself like me but it is not cost effective or as neat)
2X single battery holdershttp://www.ebay.co.uk/itm/1-2-3-4-6-8-x-AA-AAA-23A-9V-Battery-Holder-Snap-On-Connector-Enclosed-Box-Switch-/180814661762?pt=UK_BOI_Electrical_Components_Supplies_ET&var=&hash=item2a1964c882
A remote controlled key finder, you can buy whistle ones which are cheaper but I think this is the best I can find
A pencil case of your choice, make sure it will fit a small circuit board and two AA batteries in a line, also it must be easily sewn into, like neoprene fr example
some material that matches your pencil case and a needle and thread that also matches your case
You will also need a soldering iron and some spare wire
Step 2: Put It Together
They need to run in parallel to work with this design so attach the two black wires together and the two red together, make sure your wires are long enough to run i one single file line.
next you need to assemble and alter the kit, firstly do not solder the usb female port onto the circuit board, grab some spare wire and solder those on instead also add wire onto the usb port, this give us more flexibility, there are many guides on how to assemble the kit but I would just look at the original instructable:
once this is done we can prepare our case, make sure you can easily sew into you pencil case (so not metal)
then at a seem cut away a few strands of thread so that you can pop your usb through, then using the small holes in the femal usb sew the usb onto the case.
Step 3: Sewing, and More Sewing
Step 4: Never Loose It Again
Step 5: So There You Have It
*more information coming soon on the key fob*
I would just like to say thank you to the inventor of the minty boost.