2 ms·Still wearing my Casio vibration alarms. 10 year battery life can’t be beat.by j7ake 3y agoStill wearing my Casio vibration alarms. 10 year battery life can’t be beat.Pfhortune 3y agoWhich model? I've got a couple of models with vibration (GBD-100/200), but they're pretty chunky and the vibration is a little weak for my tastes.j7ake 3y agoCasio W-736H: they are indeed clunky though.