Se2300 from Creative and audio equipment transmitters, which ranges 10 meters. Bluetooth also supports the advanced audio distribution profile (a2dp), these headphones you can sync any USB Bluetooth dongle, Bluetooth-enabled PC or PDA. I think that smart se2300 headphones to manage energy consumption to be sufficient, in itself automatically when power is down Bluetooth connection is destroyed. The group also warned Beeping sound, the battery is low. The Li - ion battery lasting eight hours.