THIS IS WHAT I RECEIVED FROM JABRA ....."We are aware of an issue related to stand-by time and talk time when a Nokia6600 is connected to a JABRA BT200 or JABRA Freespeak 250 headset. Based onextensive testing and communication with Nokia certified test labs and oursupplier of the Bluetooth chip, we hereby confirm that this is related to asoftware issue with the mobile phone as the Nokia 6600 refuses to enter the'power save' (sniff) mode.If a JABRA BT200 or JABRA Freespeak 250 headset is paired with a Nokia 6600, themobile phone keeps the Bluetooth channel open and is therefore, always connectedto the headset and consequently this consumes more power. There areunfortunately no solutions at this stage to overcome this issue. Our supplierof the Bluetooth chip has reported this issue to Nokia. However, we do not knowif Nokia will release a firmware update for the Nokia 6600."Talk Time Measurements:This is a continued talk-time test, which means the headset is paired with thephone and a call is established and audio is transferred towards the headset.This is to see for how long the headset will stay connected.N6600 vs. HDW-2:Spec: 3:00h Meas.: ~2:00hN6600 vs. SE_HBH-60:Spec: 2:30h Meas.: ~1:50hN6600 vs. Plantronix M3000:Spec: 8:00h Meas.: ~4:30hN6600 vs. Jabra BT200 (Dual profile 19B):Spec: 3:00h Meas.: ~2:30hN6600 vs. Jabra FS250 (45B)Spec: 8:00h Meas.: ~4:20hSome settings in the phone like key tone and warning tones, if enabled, will betransferred towards headset. Also this will drain your battery faster because itrequires a full audio channel to be open, even without a call established.Remember also, when connected to the phone the ring tone will only appear in theheadset.