The S4Z08B212-42P  low current vibrator motor is designed to be mounted in the shell of the products housing, with its spring contact pins mating with corresponding contact pads on the PCB.  It consumes a remarkably low current of 9 ma (typical) @  3 Vdc while generating a vibration force of 0.75 Gpk.   Energy consumption is a mere 27 mw.  This series of low power consumption vibration motors are relatively high priced.  After sample approval, the minimum order is 1 master carton of 4000 pcs @  USD  2.15 ea.   CLICK  HERE to see photos of how this motor is typically mounted in the products housing.