Sony Ericsson MW600 Bluetooth Headset Specifications:

Size and weight
Size: 17.5 x 15.0 x 62.0 mm
Weight: 13.0 gram

Battery capacity
Standby time: 500 hours (up to)
Talk time: 11 hours (up to)
Stream time: 8.5 hours
FM Radio playing time: 11 hours (up to)
Battery: 170mAh

Acoustic
Speaker type: 2x 9mm dynamic, 32ohm
Ear coupling: Insert
Nominal Impedance: 32ohm
Driver type: Dynamic
Driver size: 9.2mm
Speaker frequency range: 10Hz .. 22000Hz
Sensitivity: 100 dBSPL/mW at 2kHz
Total harmonic distortion: < 0.5% (100Hz .. 10000Hz @ 1mW)
Microphone: 4mm electret

Controls
Call control
On/off
Play/pause
Volume up/down (touch type)
Next track
Previous track

Display
OLED 12 x 125 white pixels pluss border of red/green pixels

Supported Bluetooth profiles
Handsfree profile v1.5
Advanced Audio Distribution Profile v1.0
Audio Video Remote Control Profile v1.4 - Control and Target role
Headset Profile v1.1