Lights

+1 they're greeeeaaaaaatt, and cheap which is why I'm off to buy some more after losing mine...word of advice, when you cycle to the pub and then head to a club many drinks later don't put them on your belt for safekeeping as you will invariably lose them during drunken dancing

i still do this and mine aint fell off yet . . .
people keep asking me wtf is that on ur jeans, rape alarm . . .