Looks the same as apple iPhone and LG, but different to Motorola, Nokia, Palm or SonyEricsson phones.
Button wiring pin 4 to 3.
No button pressed 47000 ohm (Nexus one) or 33000 ohm (Desire S).
Phone/Play button 1 ohm
Next button 600 ohm
Back button 220 ohm
Measurement made on Nexus One headset and Desire S headset.
The HTC HD2 Headphones are the sames as on the Hero and Nexus One and HTC Desire HD.
The Middle Button is the same as on Apples iPhone Headphones but the outer buttons are incompatible and the Apple mic does not work on HTC Phones.
HTC 39H00004-00M headset wires:
|Clearcoat (inside the Green/Red)||Mic||4|
|Blue||Right Audio Ground||3|
|Gold||Left Audio Ground||3|