I have been a customer for many many years and used the E pen for many of those years. They have now replaced them it with the pro (supposedly an upgrade on the old model). DO NOT BUY. The Pro only allows you 4/5puffs before it stops working. The battery only lasts around 2hours (if you’re lucky). The pods are smaller and do not fit the old EPen. The charger for the new pro is ridiculous, so unless you are constantly near a usb point you will not be able to charge it.