Jabra BT2040 Bluetooth Battery-Powered Headset, Up to 11 hours talk time or 6 months standby with 1 battery, Compliant with most Bluetooth devices Easy to use with no need for charging; powered by replaceable AAAA battery Autopair technology for automatic pairing Automatic "sleep mode" saves power when not-in-use Up to 11 hours talk time and 6 months standby with 1 battery Compliant with most Bluetooth devices