The S4Z08B062-43P is the most efficient vibration motor we offer.  It draws 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.  If you require this motor with the rubber boot order Z4TL2B0620044P.  This rubber gasket is recommended when mounting this motor within a recessed cavity in the device and will minimize unwanted mechanical noise and ensure maximum transfer of vibration energy to the products housing.   Custom lead wire lengths are available as are connectors.    This series of  low current vibration motors are relatively high priced.  After sample approval, the minimum order is 1 master carton of 4800 pcs @  USD  2.15 ea