Tools needed are a plier to bend the wire and a screw to tighten the hose clip. This can be mounted on either a bicycle or motorcycle or maybe even places like a vehicles steering wheel or even a hang glider !!
What makes this so special is it's simplicity and good looks.
Step 1: The materials
Step 2: The materials 2
Step 3: The tools
A screw driver will come in handy to tighten the hose clip and maybe even a file to smoothen out any rough edges at the ends of the wire (you don't want to scratch you eTrex).