Difference between Ultimate Ears-Metro.fi 100 Noise Isolating Earphones & Ultimate Ears Metro. fi 2 Earphones?

[Ryan41488]

Could anyone please explain the difference between these two models (like duel drivers, etc, etc) ?..I can't find the UE 100's ANYWHERE on UE's site.

[LaaG]

Metro Fi.200:
"Single High Performance Dynamic Speaker"
"Gold Plated Connector"
"10Hz - 20,00kHz Freq Response"
"104 dB SPL/mW, 1kHz Sensitivity"
"16 OHMS Impendance"

Metro Fi.100:
"Dynamic Speaker"
"Stereo Plug"
"40Hz - 17,00kHz Freq Response"
"103 dB SPL/mW, 1kHz Sensitivity"
"17 OHMS Impendance"

Got this from my Metro.Fi 100 safety/instruction sheet thingy. They probably wont mean much.