The depth of penetration of the Diode 2020 laser is greater than that of Alex (and is suitable for those who have dark skin and bronze and with those who sunbathe and sunbathe). For this reason, it is easier to reach the hair follicles, but both devices have a cooling system. Makes you feel less pain In addition to cooling, the diode device uses a gel that those who feel pain with the Alex device do not even feel the heat of the device by applying another gel.