Up to 3 vibration modules can be used with Braze Sentina or Braze Hydra. These modules provide intuitive vibrations to indicate proximity to obstacles. They can be placed in areas such as the backrest, armrests, seat cushions, etc. Intensity of vibrations can be controlled by the knob on the controller module.Vibration modules are suggested for clients who want tactile feedback to replace or supplement the visual feedback offered by the controller module. However, these modules are NOT recommended for clients with spasticity and/or high sensitivity to vibrations.