The website ChargerLAB today published a teardown of Apple’s new 40W Dynamic Power Adapter with 60W Max, which has a key advantage over one of its other chargers.

Specifically, the teardown shows the new 40W to 60W charger is roughly the same size as Apple’s 20W charger, despite its higher wattage for faster charging speeds. In other words, you are getting more power from a smaller charger, although the 40W to 60W model costs $39 in the U.S., while the 20W option costs $19.