This 510 thread battery has every feature that your patients will need in a pen.

Manual push button allows user precision control over medication dose. Long battery life, over 100 inhalations. Fast and easy re-charging (30 minutes) 3.6 volt setting allows for a heavier draw with maximum vapor. Protective case for carrying a pen, charger and cartridge. Everything you need in one convenient package.

1 year warranty on this product.