This through-hole speaker is great for projects where you need something that sounds better than a piezo buzzer but don't have room for a full-blown speaker. This 30mm diameter speaker is encased in plastic and will handle about 100mW of power.
If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.
Skill Level: Noob - You don't need to reference a datasheet, but you will need to know basic power requirements.
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Based on 3 ratings:
5v won't get you anywhere with this. ONLY for PCB mount, too big for a breadboard. Don't buy with SMD boards.
Decent sound quality for the price / size. Fits in a breadboard (you gotta angle it, or stick one of the leads into the rails.) Won't be the loudest thing in the world if you just hook it up directly to an arduino. I haven't messed too much with amplification. Getting a few more just to have around.