The power adapter shipped with the Amazon Alexa Generation 2 Echo Dot smart speaker is a typical medium-current USB switching power supply, that features a female A style USB connector, as shown in the next picture.
The US version of this USB power supply sports a standard 120v two prong, non polarized plug, featuring non retractable prongs, as displayed next.
Foldable prongs are not always helpful, particularly for non portable applications for the Echo Dot 2, which requires external power to operate. Foldable prongs can develop intermittent connections and loosen over time, causing unreliable operation and speaker cutouts. So for the Echo Dot 2, where the adapter is not likely to be plugged and unplugged very much, we feel that concealable prongs would offer little added value to this USB adapter, and potentially lots of problems.
AC Adapter Specs
This lightweight and compact power converter, model LY87DR, LO P/N: PA 1090-7AZ1 , accepts 50-60 Hz. 100-240 volts, at 0.3 amps Max input at 11.68 Wh. It outputs 5.2 volts DC at 1.8 amps max, 9 watts, at 0.08 Wh, to the USB A style female connector at the opposite ends from the AC prongs.
The accompanying USB cable matches the black exterior of this wall adapter, and features a micro USB male connector at the small end, and a USB A male connector at the large end.
The power supply features no pilot lamp to indicate that it’s operating.
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- 2017-12-11: Originally published.