15PCS 10mmx2mm Mini Tiny Vibration Motors 10000rpm Flat Coin Button-Type Micro DC Vibrating Motor for Tablet Pager Mobile Cell Phone

These little vibrating buttons worked perfectly. The wires were quite small and difficult to strip so I had to strip them prior to giving to the students

I used these during a stem after school club. 3rd-5th graders loved using them on the robots they created

I ordered these to use to make noise in an alarm to scare squirrels from a bird feeder. Placed in a small plastic pill bottle, when activated by a PIR, it made a substantial enough noise to send the critters running. The alarm also worked for racoons and deer, but the alarm was retired to make way for a more "professional" unit. Shipping was quick and all received were tested and all worked. It is not a flaw by any means, but the wires are very small, and care must be taken when cutting insulation or soldering. Otherwise, they worked great for the project.

Scouts loved making brushbots with these motors

While it works well enough, the included mounting adhesive is not good enough for more than a couple hours without extra support pinning it in place.

gets to hot

Every single one works perfectly, and they are much stronger than I had expected, considering their size. The voltage and power requirements are low enough that they can be driven directly by logic level PWM outputs of common microcontrollers without any problems or loss of performance.

I bought 15 of these for a project for with classmates in my master's program. We ended up creating 3 prototypes of our design and all vibration motors worked effectively at a low cost. The only negative I saw was how thin the wires were. However, despite that they still worked for us. I am not sure how long they will last, but for our needs they were perfect.