Listen up! This 1.1 (30mm) diameter speaker is the perfect addition to any breadboard-based audio project where you need 8 Ohm impedance, and have 0.2W or less of power. The two pins are 15mm / 0.6 apart and fit perfectly in a breadboard or perfboard. This speaker has a durable protective plastic casing that"s still lightweight. Works great with our Wave shield or class D amplifier board (just be careful not to overdrive it)...