The 2 prong plug is retractable for traveling, and the unit has a blue light indicator to show power (I like it a lot, but some say it disturbs their sleep) - Apple & many OEM charges have no power indicator

Blue light on charger disrupts my sleep so this is my living room charger now.

Note: There is a little blue light shining when it is plugged in, not enough to disturb my sleep but just a heads-up