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: – 2x active cartridge ports – Aluminum housing with a steel base – 550 mAh battery capacity – Inhale activation – Subtle LED indicator – Optional Haptic (vibration) on inhale – Ergonomic shape – 3x Magnetic 510 screw-on adapters – 50mm braided rope Micro USB cable – Compatible with bottom airflow 510 cartridges