Look at the removable device of the POD SALT system ™ with SWITCH right now - it is the innovation which doesn't have analogs. This is a whole new level to do everything possible. By the way, their site https://www.salt-switch.fr/ - imagine a device that does not flow, does not require loading or filling and has 450 incredible puffs! The safety light indicates when the device is ready and working. Turns on when the device runs out of tightening.