Does the Behringer PK112A need a power outlet?

No. It has an internal battery, so you can run it away from mains power. Charge it before an event and keep in mind that loud playback drains the battery faster.

Can I connect a wired microphone?

Yes. It has an XLR connection plus a built-in microphone, so you can plug in a dynamic mic or use the onboard one for announcements and karaoke.

What can I play from the SD card slot?

The SD slot lets you play music files directly from a card without a phone or laptop. It is useful for set-and-forget background music.

How does it compare with a Class D powered speaker?

The PK112A uses an AB amplifier, which is generally less efficient and runs warmer than Class D designs. Class D rivals often weigh less and play longer per charge, but this one adds a built-in mic, SD playback and a remote.

Is it loud enough for a small outdoor party?

With 95 dB sensitivity and a 12-inch woofer, it covers a backyard or small patio well. For a large open field or a loud crowd, pair it with a second unit or a bigger system.