Stop Watch

How do you unlock Stop Watch?

In The Binding of Isaac, Stop Watch is unlocked by reaching 999 donate coins to the donation machine.

[Before Afterbirth] +0.3 speed. Automatically inflicts slow to all enemies in every room. / [Afterbirth before Repentance] +0.3 speed. Upon taking damage, inflicts slow to all enemies for the current room. / [Repentance] +0.3 speed. Slows all enemies in every room to 80% speed.