With Sandberg Speak’n Go In-Earset you get great sound in a stylish earset. The cable features a microphone and answer button for incoming calls, so you don't have to take the phone out of your pocket.
 
Specs:
 
Cable length: 1.2 metres
Connector: 3.5 mm MiniJack plug, 4 pole
 
Earphone:
Driver unit: 10 mm
Frequency range: 20 Hz – 20 kHz
Impedance: 32 Ohm
 
Microphone:
Type: Omni-directional condenser