Siemens HHB-750
screen, stereo, talk time 8 hours, standby time 6 days and 6 hours
Rating: 
Brand
Bluetooth headset
Siemens HHB-700
15 g, duration 3 hours, standby time of 12 days and 12 hours, 110 mAh (Li-pol)
Rating:
Siemens HHB-600
46x30x12 mm, 14 g talk time 3 hours standby time 6 days and 6 hours, 100 mAh (Li-ion)
Rating:
Siemens HHB-505
95x28x21 mm, 25 g, talk time 4 hours, standby time 6 days and 6 hours, 200 mAh (Ni-MH)
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