Soundtraxx 810089A Speaker, Round, 1/2inch , 8-Ohm

This tiny speaker has a high-output and works well for N-scale and larger models.

Dimensions: 15 x 3.5mm(D)
Frequency Response: 780Hz - 15kHz
Power: 0.3 Watt (Nominal) 0.5 Watt (Peak)
Impedance: 8 Ohms