The Haptic indicator vibrates to give you information:
1. Turn-on: 1-3 pulses to indicate battery level.
2. Turn-off: 1 pulse to indicate turn-off.
3. Multi-Tap: 1 pulse to indicate a double or triple tap.
4. Shift and Switch: 1 pulse to indicate that you have tapped Shift or Switch.
5. Mouse Click: 1 pulse to indicate that a mouse click has occurred.