The device has 3 modes, each one of them with a different treatment time(3 minutes, 5 and 8), the first mode is to get use to the device, the second and the main one is 5 minutes, and the last one is for user with longer hair, i suppose because its harder to reach the scalp so they use longer the device for longer time.
Once you press the power button the device vibrate, you may change the vibration strength by pressing the power button once more(it has 3 different vibration modes).
When turning on the device it takes few second before it comes up, it checks the battery level and whether the cartridge is proper for use or not.
I do no load the copper and zinc its in the cartridge and once it done the device will let you know it need to be replaced. It happend to me once when i lost some necessary chip while cleaning it.
The device beeps when it feel there is no proper touch with the scalp, and if it detects there's no touch for 30 seconds the device shut it self down.
Overall its pretty smart device and you can tell they put some thought behind it.
At first the treatment hurt a little, but you get use to it as time passes. The scalp will get a little reddish, you can also see some of it on my before left temple photo.
Its easier to use with buzzed/short hair to reach the scalp at the best, but it's possible with long hair as well.
Im pretty satisfied with the device so far, i still shed hairs but not at the same amount as i did before treatment and side effect free.