The Murata Piezo Vibe is a great solution for vibration notification in the wearable market with a small package at 3.8mm x 10.5mm x 2mm and a small energy footprint of 7mW (3.5VDC x 2mA). We have created an EEWiki article will be useful to anyone who might be looking at an alert system for this type of project.
If you have questions on the Wiki you can simply reply to this topic below.
For further information please see any of the following resources:
Digi-Key EEWiki - http://www.eewiki.net/display/SE/Murata+Piezo+Vibe
Manufacturer Datasheet- datasheet_pjfv.pdf (413.2 KB)