I've seen them in some of the shadier parks in the Netherlands, Italy and Austria. Yppenplatz, Vienna, has a particularly nasty (smelling) one which the countdown clock does very little to obviate.

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jakzurr 20 hours ago | parent [-]

A really nasty smell would get me out fast. Can't imagine any use for the timer, unless you're trying to estimate the remaining oxygen.

	▲	aa-jv 6 hours ago \| parent [-]
		The timer is to let the junkie know how much privacy they have left before they can be discovered in the act of shooting up.