I seen that but never heard of anyone using it.....might be something to try out if its not too expensive.....
I'll look into it......and then get back to you later tonight.....
EDIT.....I just talked to a buddy of mine who bought one for his dad......
Said it works great except it occasionally gives a false indicator....
He said that it goes off sometimes if on the bus and someone else gets a call or in the airport ....
Although the good news is he said he can't remember a time his dad missed a call.....
He keeps it in his shirt pocket and can see it at all times pretty much....
Give it a shot ther are a bunch of sites with them at a reasonable price.....
here is a review I just found.....has a laser pointer or a mini flashlight in it too....
http://www.the-gadgeteer.com/review/...or_pens_review