Here I share D-200 informations :

this is D-202PB
and ...

this is D-201PR
both of them are all low price market targeted iPhone/Androids mic earphones.
and here specification of them.
Driver Unit : 8mm Dynamic unit
Impedance : 32 Ω / 1kHz
Sensitivity : 105.5dB / 1 kHz
Power : 3mW/30mW(nom./max.)
Frequency Response : 20Hz ~ 18kHz
Connector : 3.5mm / 3pole / 24k gold Plating Plug
Cord : Flat type Rubber 1.2 M / Balanced type
Weight : 19g
sound hears really solid/hard and heavy, but bass is not fatty !