WAZA-AIR, WAZA-AIR BASS: How can the WAZA-AIR and WAZA-AIR BASS be distinguished by appearance?

The WAZA-AIR and WAZA-AIR BASS have the following differences in design.

WAZA-AIR: Silver on black. WAZA-AIR BASS: Black chrome on black.

Removing the ear pad on the right side (the side with the volume knob) reveals the model name printed on the unit.