We tested the headset on the Nokia 6820, the Motorola V600, and the Sony Ericsson T616. The sound quality was varied at times, with incoming calls sounding crystal clear, but callers on the other end of the line complained that the signal sometimes cut out. As for the battery life, Sony promises 2.5 hours of talk time and 3 days on standby. In our tests, we fell short of the rated standby time by a quarter of a day. For more Bluetooth headsets, check out our Bluetooth headset roundup.