A vibrating motor is a device that creates rapid back and forth motion, similar to shaking or vibrating, to perform various tasks or functions. Full definition
This adds a pair of vibrating motors the driver's seat cushion to silently notify the driver that one of the safety alerts has been triggered. (cnet.com)
If your left hip pops up when it should be down, the stretch sensors detect the misalignment and small vibrating motors respond with gentle buzzes in the offending area. (newscientist.com)
There is no screen or vibrating motor on the ring, just a small LED that blinks when it is charging or syncing data via Bluetooth to a smartphone app. (kpcb.com)