Compact miniature vibrating pager motor operates from .5V to 3VDC. Has removable blue insulating boot. Size about .4"L x .2"sq (excluding shaft with "D" shaped metal weight). Has 2 tabs for power hookup. Resistance of motor is 52?. Warehouse blowout pricing. Panasonic part# KHN4NX2D. These are lead free! G16777