Every single vibration motor is carefully tested during the manufacturing process.
If you don't feel vibrations during your workout please check first if:
- you are using smart training options (it is any custom goal you set-up in Swimmo mobile application),
- have you checked all the options in Swimmo mobile app -> Settings -> Swimmo Watch -> "Vibrate when..." section,
- you personally don't feel the vibrations while in the water?