The present invention relates to synchronized vibration devices that can provide {HEAD ~ haptic feedback} to {TAIL ~ a user} 
to
The present invention relates to synchronized vibration devices that can provide { HEAD ~ haptic feedback } to { TAIL ~ a user }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL