The Crystal Pro Max 4000 is a disposable vape device that comes pre-filled with 2ml of e-liquid it is designed to deliver up to 4000 puffs, making it a long-lasting and convenient option for vapers on the go. The Crystal Pro Max 4000 has a compact and stylish design, with a clear plastic body that allows you to see the e-liquid level. It features a draw-activated firing mechanism, so there are no buttons to press. The device also has a built-in airflow control system, which allows you to adjust the airflow to your liking.