Feel the HUM with optional Haptic feedback as you inhale. Always have the power you need! Your kit comes with: 1x HUM, 2x 510 adapters, 1x micro USB charging cable. Features: Aluminum housing with a steel base 650 mAh battery capacity Inhale activation Subtle LED indicator Optional Haptic (vibration) on inhale Ergonomic shape 2x Magnetic 510 screw-on adapters 50mm braided rope Micro USB cable Compatible with bottom airflow 510 cartridges