Abstract: A posture training device is immovably attached to a user's chest. On the exterior of the device, there are three LEDs, an ON/OFF button and a selector button. When the ON/OFF button is first pressed, the device boots to the ON state. A sensitivity level, indicated by one of the LEDs, is selected by momentarily pressing the selector button one to three times. A user presses and holds the central selector button, while standing or sitting in a desired posture position until he feels a vibration. The device locks on to the selected position one second after selector button release. Vibrational negative feedback is provided whenever the user slumps or slouches outside the limits permitted by the chosen sensitivity level. Vibrational positive feedback is provided when correct posture is reestablished. When the ON/OFF button is pressed again, the device shuts OFF.